Commit message: selinux,smack: fix subjective/objective credential use mixups

Jann Horn reported a problem with commit eb1231f73c4d ("selinux:
clarify task subjective and objective credentials") where some LSM
hooks were attempting to access the subjective credentials of a task
other than the current task.  Generally speaking, it is not safe to
access another task's subjective credentials and doing so can cause
a number of problems.

Further, while looking into the problem, I realized that Smack was
suffering from a similar problem brought about by a similar commit
1fb057dcde11 ("smack: differentiate between subjective and objective
task credentials").

This patch addresses this problem by restoring the use of the task's
objective credentials in those cases where the task is other than the
current executing task.  Not only does this resolve the problem
reported by Jann, it is arguably the correct thing to do in these
cases.

Cc: stable@vger.kernel.org
Fixes: eb1231f73c4d ("selinux: clarify task subjective and objective credentials")
Fixes: 1fb057dcde11 ("smack: differentiate between subjective and objective task credentials")
Reported-by: Jann Horn <jannh@google.com>
Acked-by: Eric W. Biederman <ebiederm@xmission.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
CVE: CVE-2021-43057
CWE: CWE-416
Vulnerability description: An issue was discovered in the Linux kernel before 5.14.8. A use-after-free in selinux_ptrace_traceme (aka the SELinux handler for PTRACE_TRACEME) could be used by local attackers to cause memory corruption and escalate privileges, aka CID-a3727a8bac0a. This occurs because of an attempt to access the subjective credentials of another task.

Project: linux

static int selinux_file_mprotect(struct vm_area_struct *vma,
				 unsigned long reqprot,
				 unsigned long prot)
{
	const struct cred *cred = current_cred();
	u32 sid = cred_sid(cred);

	if (checkreqprot_get(&selinux_state))
		prot = reqprot;

	if (default_noexec &&
	    (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
		int rc = 0;
		if (vma->vm_start >= vma->vm_mm->start_brk &&
		    vma->vm_end <= vma->vm_mm->brk) {
			rc = avc_has_perm(&selinux_state,
					  sid, sid, SECCLASS_PROCESS,
					  PROCESS__EXECHEAP, NULL);
		} else if (!vma->vm_file &&
			   ((vma->vm_start <= vma->vm_mm->start_stack &&
			     vma->vm_end >= vma->vm_mm->start_stack) ||
			    vma_is_stack_for_current(vma))) {
			rc = avc_has_perm(&selinux_state,
					  sid, sid, SECCLASS_PROCESS,
					  PROCESS__EXECSTACK, NULL);
		} else if (vma->vm_file && vma->anon_vma) {
			/*
			 * We are making executable a file mapping that has
			 * had some COW done. Since pages might have been
			 * written, check ability to execute the possibly
			 * modified content.  This typically should only
			 * occur for text relocations.
			 */
			rc = file_has_perm(cred, vma->vm_file, FILE__EXECMOD);
		}
		if (rc)
			return rc;
	}

	return file_map_prot_check(vma->vm_file, prot, vma->vm_flags&VM_SHARED);
}

Project: linux

static int selinux_inode_follow_link(struct dentry *dentry, struct inode *inode,
				     bool rcu)
{
	const struct cred *cred = current_cred();
	struct common_audit_data ad;
	struct inode_security_struct *isec;
	u32 sid;

	validate_creds(cred);

	ad.type = LSM_AUDIT_DATA_DENTRY;
	ad.u.dentry = dentry;
	sid = cred_sid(cred);
	isec = inode_security_rcu(inode, rcu);
	if (IS_ERR(isec))
		return PTR_ERR(isec);

	return avc_has_perm(&selinux_state,
				  sid, isec->sid, isec->sclass, FILE__READ, &ad);
}

Project: linux

static inline u32 task_sid_subj(const struct task_struct *task)
{
	u32 sid;

	rcu_read_lock();
	sid = cred_sid(rcu_dereference(task->cred));
	rcu_read_unlock();
	return sid;
}

Project: linux
File: hooks.c

static inline int dentry_has_perm(const struct cred *cred,
				  struct dentry *dentry,
				  u32 av)
{
	struct inode *inode = d_backing_inode(dentry);
	struct common_audit_data ad;

	ad.type = LSM_AUDIT_DATA_DENTRY;
	ad.u.dentry = dentry;
	__inode_security_revalidate(inode, dentry, true);
	return inode_has_perm(cred, inode, av, &ad);
}

Project: linux
File: hooks.c

static int socket_sockcreate_sid(const struct task_security_struct *tsec,
				 u16 secclass, u32 *socksid)
{
	if (tsec->sockcreate_sid > SECSID_NULL) {
		*socksid = tsec->sockcreate_sid;
		return 0;
	}

	return security_transition_sid(&selinux_state, tsec->sid, tsec->sid,
				       secclass, NULL, socksid);
}

Project: linux

static __init int smack_init(void)
{
	struct cred *cred = (struct cred *) current->cred;
	struct task_smack *tsp;

	smack_rule_cache = KMEM_CACHE(smack_rule, 0);
	if (!smack_rule_cache)
		return -ENOMEM;

	/*
	 * Set the security state for the initial task.
	 */
	tsp = smack_cred(cred);
	init_task_smack(tsp, &smack_known_floor, &smack_known_floor);

	/*
	 * Register with LSM
	 */
	security_add_hooks(smack_hooks, ARRAY_SIZE(smack_hooks), "smack");
	smack_enabled = 1;

	pr_info("Smack:  Initializing.\n");
#ifdef CONFIG_SECURITY_SMACK_NETFILTER
	pr_info("Smack:  Netfilter enabled.\n");
#endif
#ifdef SMACK_IPV6_PORT_LABELING
	pr_info("Smack:  IPv6 port labeling enabled.\n");
#endif
#ifdef SMACK_IPV6_SECMARK_LABELING
	pr_info("Smack:  IPv6 Netfilter enabled.\n");
#endif

	/* initialize the smack_known_list */
	init_smack_known_list();

	return 0;
}

Project: linux
File: hooks.c

static inline int file_path_has_perm(const struct cred *cred,
				     struct file *file,
				     u32 av)
{
	struct common_audit_data ad;

	ad.type = LSM_AUDIT_DATA_FILE;
	ad.u.file = file;
	return inode_has_perm(cred, file_inode(file), av, &ad);
}

Project: linux
File: hooks.c

static int selinux_parse_skb_ipv4(struct sk_buff *skb,
			struct common_audit_data *ad, u8 *proto)
{
	int offset, ihlen, ret = -EINVAL;
	struct iphdr _iph, *ih;

	offset = skb_network_offset(skb);
	ih = skb_header_pointer(skb, offset, sizeof(_iph), &_iph);
	if (ih == NULL)
		goto out;

	ihlen = ih->ihl * 4;
	if (ihlen < sizeof(_iph))
		goto out;

	ad->u.net->v4info.saddr = ih->saddr;
	ad->u.net->v4info.daddr = ih->daddr;
	ret = 0;

	if (proto)
		*proto = ih->protocol;

	switch (ih->protocol) {
	case IPPROTO_TCP: {
		struct tcphdr _tcph, *th;

		if (ntohs(ih->frag_off) & IP_OFFSET)
			break;

		offset += ihlen;
		th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
		if (th == NULL)
			break;

		ad->u.net->sport = th->source;
		ad->u.net->dport = th->dest;
		break;
	}

	case IPPROTO_UDP: {
		struct udphdr _udph, *uh;

		if (ntohs(ih->frag_off) & IP_OFFSET)
			break;

		offset += ihlen;
		uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
		if (uh == NULL)
			break;

		ad->u.net->sport = uh->source;
		ad->u.net->dport = uh->dest;
		break;
	}

	case IPPROTO_DCCP: {
		struct dccp_hdr _dccph, *dh;

		if (ntohs(ih->frag_off) & IP_OFFSET)
			break;

		offset += ihlen;
		dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
		if (dh == NULL)
			break;

		ad->u.net->sport = dh->dccph_sport;
		ad->u.net->dport = dh->dccph_dport;
		break;
	}

#if IS_ENABLED(CONFIG_IP_SCTP)
	case IPPROTO_SCTP: {
		struct sctphdr _sctph, *sh;

		if (ntohs(ih->frag_off) & IP_OFFSET)
			break;

		offset += ihlen;
		sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
		if (sh == NULL)
			break;

		ad->u.net->sport = sh->source;
		ad->u.net->dport = sh->dest;
		break;
	}
#endif
	default:
		break;
	}
out:
	return ret;
}

Project: linux
File: hooks.c

static struct inode_security_struct *backing_inode_security(struct dentry *dentry)
{
	struct inode *inode = d_backing_inode(dentry);

	__inode_security_revalidate(inode, dentry, true);
	return selinux_inode(inode);
}

Project: linux

static int smack_sb_eat_lsm_opts(char *options, void **mnt_opts)
{
	char *from = options, *to = options;
	bool first = true;

	while (1) {
		char *next = strchr(from, ',');
		int token, len, rc;
		char *arg = NULL;

		if (next)
			len = next - from;
		else
			len = strlen(from);

		token = match_opt_prefix(from, len, &arg);
		if (token != Opt_error) {
			arg = kmemdup_nul(arg, from + len - arg, GFP_KERNEL);
			rc = smack_add_opt(token, arg, mnt_opts);
			if (unlikely(rc)) {
				kfree(arg);
				if (*mnt_opts)
					smack_free_mnt_opts(*mnt_opts);
				*mnt_opts = NULL;
				return rc;
			}
		} else {
			if (!first) {	// copy with preceding comma
				from--;
				len++;
			}
			if (to != from)
				memmove(to, from, len);
			to += len;
			first = false;
		}
		if (!from[len])
			break;
		from += len + 1;
	}
	*to = '\0';
	return 0;
}

Project: linux
File: hooks.c

static void delayed_superblock_init(struct super_block *sb, void *unused)
{
	selinux_set_mnt_opts(sb, NULL, 0, NULL);
}

Project: linux
File: hooks.c

static inline void flush_unauthorized_files(const struct cred *cred,
					    struct files_struct *files)
{
	struct file *file, *devnull = NULL;
	struct tty_struct *tty;
	int drop_tty = 0;
	unsigned n;

	tty = get_current_tty();
	if (tty) {
		spin_lock(&tty->files_lock);
		if (!list_empty(&tty->tty_files)) {
			struct tty_file_private *file_priv;

			/* Revalidate access to controlling tty.
			   Use file_path_has_perm on the tty path directly
			   rather than using file_has_perm, as this particular
			   open file may belong to another process and we are
			   only interested in the inode-based check here. */
			file_priv = list_first_entry(&tty->tty_files,
						struct tty_file_private, list);
			file = file_priv->file;
			if (file_path_has_perm(cred, file, FILE__READ | FILE__WRITE))
				drop_tty = 1;
		}
		spin_unlock(&tty->files_lock);
		tty_kref_put(tty);
	}
	/* Reset controlling tty. */
	if (drop_tty)
		no_tty();

	/* Revalidate access to inherited open files. */
	n = iterate_fd(files, 0, match_file, cred);
	if (!n) /* none found? */
		return;

	devnull = dentry_open(&selinux_null, O_RDWR, cred);
	if (IS_ERR(devnull))
		devnull = NULL;
	/* replace all the matching ones with this */
	do {
		replace_fd(n - 1, devnull, 0);
	} while ((n = iterate_fd(files, n, match_file, cred)) != 0);
	if (devnull)
		fput(devnull);
}

Project: linux
File: hooks.c

static int selinux_kernel_create_files_as(struct cred *new, struct inode *inode)
{
	struct inode_security_struct *isec = inode_security(inode);
	struct task_security_struct *tsec = selinux_cred(new);
	u32 sid = current_sid();
	int ret;

	ret = avc_has_perm(&selinux_state,
			   sid, isec->sid,
			   SECCLASS_KERNEL_SERVICE,
			   KERNEL_SERVICE__CREATE_FILES_AS,
			   NULL);

	if (ret == 0)
		tsec->create_sid = isec->sid;
	return ret;
}

Project: linux

static int match_opt_prefix(char *s, int l, char **arg)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(smk_mount_opts); i++) {
		size_t len = smk_mount_opts[i].len;
		if (len > l || memcmp(s, smk_mount_opts[i].name, len))
			continue;
		if (len == l || s[len] != '=')
			continue;
		*arg = s + len + 1;
		return smk_mount_opts[i].opt;
	}
	return Opt_error;
}

Project: linux
File: hooks.c

static int selinux_file_open(struct file *file)
{
	struct file_security_struct *fsec;
	struct inode_security_struct *isec;

	fsec = selinux_file(file);
	isec = inode_security(file_inode(file));
	/*
	 * Save inode label and policy sequence number
	 * at open-time so that selinux_file_permission
	 * can determine whether revalidation is necessary.
	 * Task label is already saved in the file security
	 * struct as its SID.
	 */
	fsec->isid = isec->sid;
	fsec->pseqno = avc_policy_seqno(&selinux_state);
	/*
	 * Since the inode label or policy seqno may have changed
	 * between the selinux_inode_permission check and the saving
	 * of state above, recheck that access is still permitted.
	 * Otherwise, access might never be revalidated against the
	 * new inode label or new policy.
	 * This check is not redundant - do not remove.
	 */
	return file_path_has_perm(file->f_cred, file, open_file_to_av(file));
}

Project: linux
File: hooks.c

static int selinux_netcache_avc_callback(u32 event)
{
	if (event == AVC_CALLBACK_RESET) {
		sel_netif_flush();
		sel_netnode_flush();
		sel_netport_flush();
		synchronize_net();
	}
	return 0;
}

Project: linux
File: hooks.c

static int selinux_tun_dev_attach_queue(void *security)
{
	struct tun_security_struct *tunsec = security;

	return avc_has_perm(&selinux_state,
			    current_sid(), tunsec->sid, SECCLASS_TUN_SOCKET,
			    TUN_SOCKET__ATTACH_QUEUE, NULL);
}

Project: linux

static int smack_file_receive(struct file *file)
{
	int rc;
	int may = 0;
	struct smk_audit_info ad;
	struct inode *inode = file_inode(file);
	struct socket *sock;
	struct task_smack *tsp;
	struct socket_smack *ssp;

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
	smk_ad_setfield_u_fs_path(&ad, file->f_path);

	if (inode->i_sb->s_magic == SOCKFS_MAGIC) {
		sock = SOCKET_I(inode);
		ssp = sock->sk->sk_security;
		tsp = smack_cred(current_cred());
		/*
		 * If the receiving process can't write to the
		 * passed socket or if the passed socket can't
		 * write to the receiving process don't accept
		 * the passed socket.
		 */
		rc = smk_access(tsp->smk_task, ssp->smk_out, MAY_WRITE, &ad);
		rc = smk_bu_file(file, may, rc);
		if (rc < 0)
			return rc;
		rc = smk_access(ssp->smk_in, tsp->smk_task, MAY_WRITE, &ad);
		rc = smk_bu_file(file, may, rc);
		return rc;
	}
	/*
	 * This code relies on bitmasks.
	 */
	if (file->f_mode & FMODE_READ)
		may = MAY_READ;
	if (file->f_mode & FMODE_WRITE)
		may |= MAY_WRITE;

	rc = smk_curacc(smk_of_inode(inode), may, &ad);
	rc = smk_bu_file(file, may, rc);
	return rc;
}

Project: linux
File: hooks.c

static unsigned int selinux_ipv6_output(void *priv,
					struct sk_buff *skb,
					const struct nf_hook_state *state)
{
	return selinux_ip_output(skb, PF_INET6);
}

Project: linux
File: hooks.c

static int selinux_revalidate_file_permission(struct file *file, int mask)
{
	const struct cred *cred = current_cred();
	struct inode *inode = file_inode(file);

	/* file_mask_to_av won't add FILE__WRITE if MAY_APPEND is set */
	if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
		mask |= MAY_APPEND;

	return file_has_perm(cred, file,
			     file_mask_to_av(inode->i_mode, mask));
}

Project: linux
File: hooks.c

static int selinux_task_alloc(struct task_struct *task,
			      unsigned long clone_flags)
{
	u32 sid = current_sid();

	return avc_has_perm(&selinux_state,
			    sid, sid, SECCLASS_PROCESS, PROCESS__FORK, NULL);
}

Project: linux
File: hooks.c

void selinux_complete_init(void)
{
	pr_debug("SELinux:  Completing initialization.\n");

	/* Set up any superblocks initialized prior to the policy load. */
	pr_debug("SELinux:  Setting up existing superblocks.\n");
	iterate_supers(delayed_superblock_init, NULL);
}

Project: linux
File: hooks.c

static int selinux_inode_getxattr(struct dentry *dentry, const char *name)
{
	const struct cred *cred = current_cred();

	return dentry_has_perm(cred, dentry, FILE__GETATTR);
}

Project: linux

static int selinux_inode_listsecurity(struct inode *inode, char *buffer, size_t buffer_size)
{
	const int len = sizeof(XATTR_NAME_SELINUX);

	if (!selinux_initialized(&selinux_state))
		return 0;

	if (buffer && len <= buffer_size)
		memcpy(buffer, XATTR_NAME_SELINUX, len);
	return len;
}

Project: linux

static int smack_file_ioctl(struct file *file, unsigned int cmd,
			    unsigned long arg)
{
	int rc = 0;
	struct smk_audit_info ad;
	struct inode *inode = file_inode(file);

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
	smk_ad_setfield_u_fs_path(&ad, file->f_path);

	if (_IOC_DIR(cmd) & _IOC_WRITE) {
		rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
		rc = smk_bu_file(file, MAY_WRITE, rc);
	}

	if (rc == 0 && (_IOC_DIR(cmd) & _IOC_READ)) {
		rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
		rc = smk_bu_file(file, MAY_READ, rc);
	}

	return rc;
}

Project: linux
File: hooks.c

static void selinux_ipc_getsecid(struct kern_ipc_perm *ipcp, u32 *secid)
{
	struct ipc_security_struct *isec = selinux_ipc(ipcp);
	*secid = isec->sid;
}

Project: linux
File: hooks.c

static void selinux_sk_free_security(struct sock *sk)
{
	struct sk_security_struct *sksec = sk->sk_security;

	sk->sk_security = NULL;
	selinux_netlbl_sk_security_free(sksec);
	kfree(sksec);
}

Project: linux

static int selinux_task_movememory(struct task_struct *p)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
			    PROCESS__SETSCHED, NULL);
}

Project: linux

static int selinux_bprm_creds_for_exec(struct linux_binprm *bprm)
{
	const struct task_security_struct *old_tsec;
	struct task_security_struct *new_tsec;
	struct inode_security_struct *isec;
	struct common_audit_data ad;
	struct inode *inode = file_inode(bprm->file);
	int rc;

	/* SELinux context only depends on initial program or script and not
	 * the script interpreter */

	old_tsec = selinux_cred(current_cred());
	new_tsec = selinux_cred(bprm->cred);
	isec = inode_security(inode);

	/* Default to the current task SID. */
	new_tsec->sid = old_tsec->sid;
	new_tsec->osid = old_tsec->sid;

	/* Reset fs, key, and sock SIDs on execve. */
	new_tsec->create_sid = 0;
	new_tsec->keycreate_sid = 0;
	new_tsec->sockcreate_sid = 0;

	if (old_tsec->exec_sid) {
		new_tsec->sid = old_tsec->exec_sid;
		/* Reset exec SID on execve. */
		new_tsec->exec_sid = 0;

		/* Fail on NNP or nosuid if not an allowed transition. */
		rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
		if (rc)
			return rc;
	} else {
		/* Check for a default transition on this program. */
		rc = security_transition_sid(&selinux_state, old_tsec->sid,
					     isec->sid, SECCLASS_PROCESS, NULL,
					     &new_tsec->sid);
		if (rc)
			return rc;

		/*
		 * Fallback to old SID on NNP or nosuid if not an allowed
		 * transition.
		 */
		rc = check_nnp_nosuid(bprm, old_tsec, new_tsec);
		if (rc)
			new_tsec->sid = old_tsec->sid;
	}

	ad.type = LSM_AUDIT_DATA_FILE;
	ad.u.file = bprm->file;

	if (new_tsec->sid == old_tsec->sid) {
		rc = avc_has_perm(&selinux_state,
				  old_tsec->sid, isec->sid,
				  SECCLASS_FILE, FILE__EXECUTE_NO_TRANS, &ad);
		if (rc)
			return rc;
	} else {
		/* Check permissions for the transition. */
		rc = avc_has_perm(&selinux_state,
				  old_tsec->sid, new_tsec->sid,
				  SECCLASS_PROCESS, PROCESS__TRANSITION, &ad);
		if (rc)
			return rc;

		rc = avc_has_perm(&selinux_state,
				  new_tsec->sid, isec->sid,
				  SECCLASS_FILE, FILE__ENTRYPOINT, &ad);
		if (rc)
			return rc;

		/* Check for shared state */
		if (bprm->unsafe & LSM_UNSAFE_SHARE) {
			rc = avc_has_perm(&selinux_state,
					  old_tsec->sid, new_tsec->sid,
					  SECCLASS_PROCESS, PROCESS__SHARE,
					  NULL);
			if (rc)
				return -EPERM;
		}

		/* Make sure that anyone attempting to ptrace over a task that
		 * changes its SID has the appropriate permit */
		if (bprm->unsafe & LSM_UNSAFE_PTRACE) {
			u32 ptsid = ptrace_parent_sid();
			if (ptsid != 0) {
				rc = avc_has_perm(&selinux_state,
						  ptsid, new_tsec->sid,
						  SECCLASS_PROCESS,
						  PROCESS__PTRACE, NULL);
				if (rc)
					return -EPERM;
			}
		}

		/* Clear any possibly unsafe personality bits on exec: */
		bprm->per_clear |= PER_CLEAR_ON_SETID;

		/* Enable secure mode for SIDs transitions unless
		   the noatsecure permission is granted between
		   the two SIDs, i.e. ahp returns 0. */
		rc = avc_has_perm(&selinux_state,
				  old_tsec->sid, new_tsec->sid,
				  SECCLASS_PROCESS, PROCESS__NOATSECURE,
				  NULL);
		bprm->secureexec |= !!rc;
	}

	return 0;
}

Project: linux
File: hooks.c

static int selinux_inode_rename(struct inode *old_inode, struct dentry *old_dentry,
				struct inode *new_inode, struct dentry *new_dentry)
{
	return may_rename(old_inode, old_dentry, new_inode, new_dentry);
}

Project: linux

static int smack_ismaclabel(const char *name)
{
	return (strcmp(name, XATTR_SMACK_SUFFIX) == 0);
}

Project: linux

static int smack_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
	struct smack_known *skp = smack_from_secid(secid);

	if (secdata)
		*secdata = skp->smk_known;
	*seclen = strlen(skp->smk_known);
	return 0;
}

Project: linux
File: hooks.c

static int selinux_inode_copy_up_xattr(const char *name)
{
	/* The copy_up hook above sets the initial context on an inode, but we
	 * don't then want to overwrite it by blindly copying all the lower
	 * xattrs up.  Instead, we have to filter out SELinux-related xattrs.
	 */
	if (strcmp(name, XATTR_NAME_SELINUX) == 0)
		return 1; /* Discard */
	/*
	 * Any other attribute apart from SELINUX is not claimed, supported
	 * by selinux.
	 */
	return -EOPNOTSUPP;
}

Project: linux

static int selinux_task_getsid(struct task_struct *p)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
			    PROCESS__GETSESSION, NULL);
}

Project: linux

static void selinux_task_to_inode(struct task_struct *p,
				  struct inode *inode)
{
	struct inode_security_struct *isec = selinux_inode(inode);
	u32 sid = task_sid_obj(p);

	spin_lock(&isec->lock);
	isec->sclass = inode_mode_to_security_class(inode->i_mode);
	isec->sid = sid;
	isec->initialized = LABEL_INITIALIZED;
	spin_unlock(&isec->lock);
}

Project: linux

static int smk_curacc_shm(struct kern_ipc_perm *isp, int access)
{
	struct smack_known *ssp = smack_of_ipc(isp);
	struct smk_audit_info ad;
	int rc;

#ifdef CONFIG_AUDIT
	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
	ad.a.u.ipc_id = isp->id;
#endif
	rc = smk_curacc(ssp, access, &ad);
	rc = smk_bu_current("shm", ssp, access, rc);
	return rc;
}

Project: linux
File: hooks.c

static int selinux_cred_prepare(struct cred *new, const struct cred *old,
				gfp_t gfp)
{
	const struct task_security_struct *old_tsec = selinux_cred(old);
	struct task_security_struct *tsec = selinux_cred(new);

	*tsec = *old_tsec;
	return 0;
}

Project: linux

static int smack_inode_getattr(const struct path *path)
{
	struct smk_audit_info ad;
	struct inode *inode = d_backing_inode(path->dentry);
	int rc;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
	smk_ad_setfield_u_fs_path(&ad, *path);
	rc = smk_curacc(smk_of_inode(inode), MAY_READ, &ad);
	rc = smk_bu_inode(inode, MAY_READ, rc);
	return rc;
}

Project: linux

static int selinux_task_getpgid(struct task_struct *p)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
			    PROCESS__GETPGID, NULL);
}

Project: linux
File: hooks.c

static int selinux_lsm_notifier_avc_callback(u32 event)
{
	if (event == AVC_CALLBACK_RESET) {
		sel_ib_pkey_flush();
		call_blocking_lsm_notifier(LSM_POLICY_CHANGE, NULL);
	}

	return 0;
}

Project: linux

static int smack_task_setpgid(struct task_struct *p, pid_t pgid)
{
	return smk_curacc_on_task(p, MAY_WRITE, __func__);
}

Project: linux

static int selinux_inode_getsecurity(struct user_namespace *mnt_userns,
				     struct inode *inode, const char *name,
				     void **buffer, bool alloc)
{
	u32 size;
	int error;
	char *context = NULL;
	struct inode_security_struct *isec;

	/*
	 * If we're not initialized yet, then we can't validate contexts, so
	 * just let vfs_getxattr fall back to using the on-disk xattr.
	 */
	if (!selinux_initialized(&selinux_state) ||
	    strcmp(name, XATTR_SELINUX_SUFFIX))
		return -EOPNOTSUPP;

	/*
	 * If the caller has CAP_MAC_ADMIN, then get the raw context
	 * value even if it is not defined by current policy; otherwise,
	 * use the in-core value under current policy.
	 * Use the non-auditing forms of the permission checks since
	 * getxattr may be called by unprivileged processes commonly
	 * and lack of permission just means that we fall back to the
	 * in-core context value, not a denial.
	 */
	isec = inode_security(inode);
	if (has_cap_mac_admin(false))
		error = security_sid_to_context_force(&selinux_state,
						      isec->sid, &context,
						      &size);
	else
		error = security_sid_to_context(&selinux_state, isec->sid,
						&context, &size);
	if (error)
		return error;
	error = size;
	if (alloc) {
		*buffer = context;
		goto out_nofree;
	}
	kfree(context);
out_nofree:
	return error;
}

Project: linux
File: hooks.c

static int selinux_bpf_map_alloc(struct bpf_map *map)
{
	struct bpf_security_struct *bpfsec;

	bpfsec = kzalloc(sizeof(*bpfsec), GFP_KERNEL);
	if (!bpfsec)
		return -ENOMEM;

	bpfsec->sid = current_sid();
	map->security = bpfsec;

	return 0;
}

Project: linux
File: hooks.c

static int selinux_tun_dev_attach(struct sock *sk, void *security)
{
	struct tun_security_struct *tunsec = security;
	struct sk_security_struct *sksec = sk->sk_security;

	/* we don't currently perform any NetLabel based labeling here and it
	 * isn't clear that we would want to do so anyway; while we could apply
	 * labeling without the support of the TUN user the resulting labeled
	 * traffic from the other end of the connection would almost certainly
	 * cause confusion to the TUN user that had no idea network labeling
	 * protocols were being used */

	sksec->sid = tunsec->sid;
	sksec->sclass = SECCLASS_TUN_SOCKET;

	return 0;
}

Project: linux

static int smack_inode_init_security(struct inode *inode, struct inode *dir,
				     const struct qstr *qstr, const char **name,
				     void **value, size_t *len)
{
	struct inode_smack *issp = smack_inode(inode);
	struct smack_known *skp = smk_of_current();
	struct smack_known *isp = smk_of_inode(inode);
	struct smack_known *dsp = smk_of_inode(dir);
	int may;

	if (name)
		*name = XATTR_SMACK_SUFFIX;

	if (value && len) {
		rcu_read_lock();
		may = smk_access_entry(skp->smk_known, dsp->smk_known,
				       &skp->smk_rules);
		rcu_read_unlock();

		/*
		 * If the access rule allows transmutation and
		 * the directory requests transmutation then
		 * by all means transmute.
		 * Mark the inode as changed.
		 */
		if (may > 0 && ((may & MAY_TRANSMUTE) != 0) &&
		    smk_inode_transmutable(dir)) {
			isp = dsp;
			issp->smk_flags |= SMK_INODE_CHANGED;
		}

		*value = kstrdup(isp->smk_known, GFP_NOFS);
		if (*value == NULL)
			return -ENOMEM;

		*len = strlen(isp->smk_known);
	}

	return 0;
}

Project: linux

static int smk_bu_inode(struct inode *inode, int mode, int rc)
{
	struct task_smack *tsp = smack_cred(current_cred());
	struct inode_smack *isp = smack_inode(inode);
	char acc[SMK_NUM_ACCESS_TYPE + 1];

	if (isp->smk_flags & SMK_INODE_IMPURE)
		pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
			inode->i_sb->s_id, inode->i_ino, current->comm);

	if (rc <= 0)
		return rc;
	if (rc > SMACK_UNCONFINED_OBJECT)
		rc = 0;
	if (rc == SMACK_UNCONFINED_SUBJECT &&
	    (mode & (MAY_WRITE | MAY_APPEND)))
		isp->smk_flags |= SMK_INODE_IMPURE;

	smk_bu_mode(mode, acc);

	pr_info("Smack %s: (%s %s %s) inode=(%s %ld) %s\n", smk_bu_mess[rc],
		tsp->smk_task->smk_known, isp->smk_inode->smk_known, acc,
		inode->i_sb->s_id, inode->i_ino, current->comm);
	return 0;
}

Project: linux

static int selinux_file_fcntl(struct file *file, unsigned int cmd,
			      unsigned long arg)
{
	const struct cred *cred = current_cred();
	int err = 0;

	switch (cmd) {
	case F_SETFL:
		if ((file->f_flags & O_APPEND) && !(arg & O_APPEND)) {
			err = file_has_perm(cred, file, FILE__WRITE);
			break;
		}
		fallthrough;
	case F_SETOWN:
	case F_SETSIG:
	case F_GETFL:
	case F_GETOWN:
	case F_GETSIG:
	case F_GETOWNER_UIDS:
		/* Just check FD__USE permission */
		err = file_has_perm(cred, file, 0);
		break;
	case F_GETLK:
	case F_SETLK:
	case F_SETLKW:
	case F_OFD_GETLK:
	case F_OFD_SETLK:
	case F_OFD_SETLKW:
#if BITS_PER_LONG == 32
	case F_GETLK64:
	case F_SETLK64:
	case F_SETLKW64:
#endif
		err = file_has_perm(cred, file, FILE__LOCK);
		break;
	}

	return err;
}

Project: linux

static int smack_inode_copy_up_xattr(const char *name)
{
	/*
	 * Return 1 if this is the smack access Smack attribute.
	 */
	if (strcmp(name, XATTR_NAME_SMACK) == 0)
		return 1;

	return -EOPNOTSUPP;
}

Project: linux

static int smack_inode_getsecurity(struct user_namespace *mnt_userns,
				   struct inode *inode, const char *name,
				   void **buffer, bool alloc)
{
	struct socket_smack *ssp;
	struct socket *sock;
	struct super_block *sbp;
	struct inode *ip = (struct inode *)inode;
	struct smack_known *isp;

	if (strcmp(name, XATTR_SMACK_SUFFIX) == 0)
		isp = smk_of_inode(inode);
	else {
		/*
		 * The rest of the Smack xattrs are only on sockets.
		 */
		sbp = ip->i_sb;
		if (sbp->s_magic != SOCKFS_MAGIC)
			return -EOPNOTSUPP;

		sock = SOCKET_I(ip);
		if (sock == NULL || sock->sk == NULL)
			return -EOPNOTSUPP;

		ssp = sock->sk->sk_security;

		if (strcmp(name, XATTR_SMACK_IPIN) == 0)
			isp = ssp->smk_in;
		else if (strcmp(name, XATTR_SMACK_IPOUT) == 0)
			isp = ssp->smk_out;
		else
			return -EOPNOTSUPP;
	}

	if (alloc) {
		*buffer = kstrdup(isp->smk_known, GFP_KERNEL);
		if (*buffer == NULL)
			return -ENOMEM;
	}

	return strlen(isp->smk_known);
}

Project: linux
File: hooks.c

static int selinux_dentry_init_security(struct dentry *dentry, int mode,
					const struct qstr *name, void **ctx,
					u32 *ctxlen)
{
	u32 newsid;
	int rc;

	rc = selinux_determine_inode_label(selinux_cred(current_cred()),
					   d_inode(dentry->d_parent), name,
					   inode_mode_to_security_class(mode),
					   &newsid);
	if (rc)
		return rc;

	return security_sid_to_context(&selinux_state, newsid, (char **)ctx,
				       ctxlen);
}

Project: linux

static void smack_free_mnt_opts(void *mnt_opts)
{
	struct smack_mnt_opts *opts = mnt_opts;
	kfree(opts->fsdefault);
	kfree(opts->fsfloor);
	kfree(opts->fshat);
	kfree(opts->fsroot);
	kfree(opts->fstransmute);
	kfree(opts);
}

Project: linux
File: hooks.c

static int selinux_netlink_send(struct sock *sk, struct sk_buff *skb)
{
	int rc = 0;
	unsigned int msg_len;
	unsigned int data_len = skb->len;
	unsigned char *data = skb->data;
	struct nlmsghdr *nlh;
	struct sk_security_struct *sksec = sk->sk_security;
	u16 sclass = sksec->sclass;
	u32 perm;

	while (data_len >= nlmsg_total_size(0)) {
		nlh = (struct nlmsghdr *)data;

		/* NOTE: the nlmsg_len field isn't reliably set by some netlink
		 *       users which means we can't reject skb's with bogus
		 *       length fields; our solution is to follow what
		 *       netlink_rcv_skb() does and simply skip processing at
		 *       messages with length fields that are clearly junk
		 */
		if (nlh->nlmsg_len < NLMSG_HDRLEN || nlh->nlmsg_len > data_len)
			return 0;

		rc = selinux_nlmsg_lookup(sclass, nlh->nlmsg_type, &perm);
		if (rc == 0) {
			rc = sock_has_perm(sk, perm);
			if (rc)
				return rc;
		} else if (rc == -EINVAL) {
			/* -EINVAL is a missing msg/perm mapping */
			pr_warn_ratelimited("SELinux: unrecognized netlink"
				" message: protocol=%hu nlmsg_type=%hu sclass=%s"
				" pid=%d comm=%s\n",
				sk->sk_protocol, nlh->nlmsg_type,
				secclass_map[sclass - 1].name,
				task_pid_nr(current), current->comm);
			if (enforcing_enabled(&selinux_state) &&
			    !security_get_allow_unknown(&selinux_state))
				return rc;
			rc = 0;
		} else if (rc == -ENOENT) {
			/* -ENOENT is a missing socket/class mapping, ignore */
			rc = 0;
		} else {
			return rc;
		}

		/* move to the next message after applying netlink padding */
		msg_len = NLMSG_ALIGN(nlh->nlmsg_len);
		if (msg_len >= data_len)
			return 0;
		data_len -= msg_len;
		data += msg_len;
	}

	return rc;
}

Project: linux

static int smack_msg_queue_msgsnd(struct kern_ipc_perm *isp, struct msg_msg *msg,
				  int msqflg)
{
	int may;

	may = smack_flags_to_may(msqflg);
	return smk_curacc_msq(isp, may);
}

Project: linux
File: hooks.c

static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
				  int size)
{
	return sock_has_perm(sock->sk, SOCKET__WRITE);
}

Project: linux
File: hooks.c

static int selinux_ib_alloc_security(void **ib_sec)
{
	struct ib_security_struct *sec;

	sec = kzalloc(sizeof(*sec), GFP_KERNEL);
	if (!sec)
		return -ENOMEM;
	sec->sid = current_sid();

	*ib_sec = sec;
	return 0;
}

Project: linux

static int smack_task_getioprio(struct task_struct *p)
{
	return smk_curacc_on_task(p, MAY_READ, __func__);
}

Project: linux
File: hooks.c

static int selinux_add_opt(int token, const char *s, void **mnt_opts)
{
	struct selinux_mnt_opts *opts = *mnt_opts;

	if (token == Opt_seclabel)	/* eaten and completely ignored */
		return 0;

	if (!opts) {
		opts = kzalloc(sizeof(struct selinux_mnt_opts), GFP_KERNEL);
		if (!opts)
			return -ENOMEM;
		*mnt_opts = opts;
	}
	if (!s)
		return -ENOMEM;
	switch (token) {
	case Opt_context:
		if (opts->context || opts->defcontext)
			goto Einval;
		opts->context = s;
		break;
	case Opt_fscontext:
		if (opts->fscontext)
			goto Einval;
		opts->fscontext = s;
		break;
	case Opt_rootcontext:
		if (opts->rootcontext)
			goto Einval;
		opts->rootcontext = s;
		break;
	case Opt_defcontext:
		if (opts->context || opts->defcontext)
			goto Einval;
		opts->defcontext = s;
		break;
	}
	return 0;
Einval:
	pr_warn(SEL_MOUNT_FAIL_MSG);
	return -EINVAL;
}

Project: linux

static void selinux_task_getsecid_subj(struct task_struct *p, u32 *secid)
{
	*secid = task_sid_subj(p);
}

Project: linux
File: hooks.c

static int selinux_bpf(int cmd, union bpf_attr *attr,
				     unsigned int size)
{
	u32 sid = current_sid();
	int ret;

	switch (cmd) {
	case BPF_MAP_CREATE:
		ret = avc_has_perm(&selinux_state,
				   sid, sid, SECCLASS_BPF, BPF__MAP_CREATE,
				   NULL);
		break;
	case BPF_PROG_LOAD:
		ret = avc_has_perm(&selinux_state,
				   sid, sid, SECCLASS_BPF, BPF__PROG_LOAD,
				   NULL);
		break;
	default:
		ret = 0;
		break;
	}

	return ret;
}

Project: linux
File: hooks.c

static int selinux_fs_context_parse_param(struct fs_context *fc,
					  struct fs_parameter *param)
{
	struct fs_parse_result result;
	int opt, rc;

	opt = fs_parse(fc, selinux_fs_parameters, param, &result);
	if (opt < 0)
		return opt;

	rc = selinux_add_opt(opt, param->string, &fc->security);
	if (!rc) {
		param->string = NULL;
		rc = 1;
	}
	return rc;
}

Project: linux

static int selinux_task_setnice(struct task_struct *p, int nice)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
			    PROCESS__SETSCHED, NULL);
}

Project: linux
File: hooks.c

static int selinux_quota_on(struct dentry *dentry)
{
	const struct cred *cred = current_cred();

	return dentry_has_perm(cred, dentry, FILE__QUOTAON);
}

Project: linux

static int smack_sem_semctl(struct kern_ipc_perm *isp, int cmd)
{
	int may;

	switch (cmd) {
	case GETPID:
	case GETNCNT:
	case GETZCNT:
	case GETVAL:
	case GETALL:
	case IPC_STAT:
	case SEM_STAT:
	case SEM_STAT_ANY:
		may = MAY_READ;
		break;
	case SETVAL:
	case SETALL:
	case IPC_RMID:
	case IPC_SET:
		may = MAY_READWRITE;
		break;
	case IPC_INFO:
	case SEM_INFO:
		/*
		 * System level information
		 */
		return 0;
	default:
		return -EINVAL;
	}

	return smk_curacc_sem(isp, may);
}

Project: linux

static struct smack_known *smk_fetch(const char *name, struct inode *ip,
					struct dentry *dp)
{
	int rc;
	char *buffer;
	struct smack_known *skp = NULL;

	if (!(ip->i_opflags & IOP_XATTR))
		return ERR_PTR(-EOPNOTSUPP);

	buffer = kzalloc(SMK_LONGLABEL, GFP_NOFS);
	if (buffer == NULL)
		return ERR_PTR(-ENOMEM);

	rc = __vfs_getxattr(dp, ip, name, buffer, SMK_LONGLABEL);
	if (rc < 0)
		skp = ERR_PTR(rc);
	else if (rc == 0)
		skp = NULL;
	else
		skp = smk_import_entry(buffer, rc);

	kfree(buffer);

	return skp;
}

Project: linux

static inline u32 task_sid_binder(const struct task_struct *task)
{
	/*
	 * In many case where this function is used we should be using the
	 * task's subjective SID, but we can't reliably access the subjective
	 * creds of a task other than our own so we must use the objective
	 * creds/SID, which are safe to access.  The downside is that if a task
	 * is temporarily overriding it's creds it will not be reflected here;
	 * however, it isn't clear that binder would handle that case well
	 * anyway.
	 *
	 * If this ever changes and we can safely reference the subjective
	 * creds/SID of another task, this function will make it easier to
	 * identify the various places where we make use of the task SIDs in
	 * the binder code.  It is also likely that we will need to adjust
	 * the main drivers/android binder code as well.
	 */
	return task_sid_obj(task);
}

Project: linux

static int smack_file_alloc_security(struct file *file)
{
	struct smack_known **blob = smack_file(file);

	*blob = smk_of_current();
	return 0;
}

Project: linux

static int smack_audit_rule_init(u32 field, u32 op, char *rulestr, void **vrule)
{
	struct smack_known *skp;
	char **rule = (char **)vrule;
	*rule = NULL;

	if (field != AUDIT_SUBJ_USER && field != AUDIT_OBJ_USER)
		return -EINVAL;

	if (op != Audit_equal && op != Audit_not_equal)
		return -EINVAL;

	skp = smk_import_entry(rulestr, 0);
	if (IS_ERR(skp))
		return PTR_ERR(skp);

	*rule = skp->smk_known;

	return 0;
}

Project: linux
File: hooks.c

static int selinux_key_getsecurity(struct key *key, char **_buffer)
{
	struct key_security_struct *ksec = key->security;
	char *context = NULL;
	unsigned len;
	int rc;

	rc = security_sid_to_context(&selinux_state, ksec->sid,
				     &context, &len);
	if (!rc)
		rc = len;
	*_buffer = context;
	return rc;
}

Project: linux
File: hooks.c

static int selinux_key_alloc(struct key *k, const struct cred *cred,
			     unsigned long flags)
{
	const struct task_security_struct *tsec;
	struct key_security_struct *ksec;

	ksec = kzalloc(sizeof(struct key_security_struct), GFP_KERNEL);
	if (!ksec)
		return -ENOMEM;

	tsec = selinux_cred(cred);
	if (tsec->keycreate_sid)
		ksec->sid = tsec->keycreate_sid;
	else
		ksec->sid = tsec->sid;

	k->security = ksec;
	return 0;
}

Project: linux
File: hooks.c

static int selinux_shm_alloc_security(struct kern_ipc_perm *shp)
{
	struct ipc_security_struct *isec;
	struct common_audit_data ad;
	u32 sid = current_sid();
	int rc;

	isec = selinux_ipc(shp);
	ipc_init_security(isec, SECCLASS_SHM);

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = shp->key;

	rc = avc_has_perm(&selinux_state,
			  sid, isec->sid, SECCLASS_SHM,
			  SHM__CREATE, &ad);
	return rc;
}

Project: linux
File: hooks.c

static inline int may_rename(struct inode *old_dir,
			     struct dentry *old_dentry,
			     struct inode *new_dir,
			     struct dentry *new_dentry)
{
	struct inode_security_struct *old_dsec, *new_dsec, *old_isec, *new_isec;
	struct common_audit_data ad;
	u32 sid = current_sid();
	u32 av;
	int old_is_dir, new_is_dir;
	int rc;

	old_dsec = inode_security(old_dir);
	old_isec = backing_inode_security(old_dentry);
	old_is_dir = d_is_dir(old_dentry);
	new_dsec = inode_security(new_dir);

	ad.type = LSM_AUDIT_DATA_DENTRY;

	ad.u.dentry = old_dentry;
	rc = avc_has_perm(&selinux_state,
			  sid, old_dsec->sid, SECCLASS_DIR,
			  DIR__REMOVE_NAME | DIR__SEARCH, &ad);
	if (rc)
		return rc;
	rc = avc_has_perm(&selinux_state,
			  sid, old_isec->sid,
			  old_isec->sclass, FILE__RENAME, &ad);
	if (rc)
		return rc;
	if (old_is_dir && new_dir != old_dir) {
		rc = avc_has_perm(&selinux_state,
				  sid, old_isec->sid,
				  old_isec->sclass, DIR__REPARENT, &ad);
		if (rc)
			return rc;
	}

	ad.u.dentry = new_dentry;
	av = DIR__ADD_NAME | DIR__SEARCH;
	if (d_is_positive(new_dentry))
		av |= DIR__REMOVE_NAME;
	rc = avc_has_perm(&selinux_state,
			  sid, new_dsec->sid, SECCLASS_DIR, av, &ad);
	if (rc)
		return rc;
	if (d_is_positive(new_dentry)) {
		new_isec = backing_inode_security(new_dentry);
		new_is_dir = d_is_dir(new_dentry);
		rc = avc_has_perm(&selinux_state,
				  sid, new_isec->sid,
				  new_isec->sclass,
				  (new_is_dir ? DIR__RMDIR : FILE__UNLINK), &ad);
		if (rc)
			return rc;
	}

	return 0;
}

Project: linux

static int smack_kernel_act_as(struct cred *new, u32 secid)
{
	struct task_smack *new_tsp = smack_cred(new);

	new_tsp->smk_task = smack_from_secid(secid);
	return 0;
}

Project: linux

static void init_inode_smack(struct inode *inode, struct smack_known *skp)
{
	struct inode_smack *isp = smack_inode(inode);

	isp->smk_inode = skp;
	isp->smk_flags = 0;
}

Project: linux
File: hooks.c

static int selinux_peerlbl_enabled(void)
{
	return (selinux_policycap_alwaysnetwork() ||
		netlbl_enabled() || selinux_xfrm_enabled());
}

Project: linux
File: hooks.c

static void cred_init_security(void)
{
	struct cred *cred = (struct cred *) current->real_cred;
	struct task_security_struct *tsec;

	tsec = selinux_cred(cred);
	tsec->osid = tsec->sid = SECINITSID_KERNEL;
}

Project: linux

static int smack_inode_permission(struct inode *inode, int mask)
{
	struct superblock_smack *sbsp = smack_superblock(inode->i_sb);
	struct smk_audit_info ad;
	int no_block = mask & MAY_NOT_BLOCK;
	int rc;

	mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);
	/*
	 * No permission to check. Existence test. Yup, it's there.
	 */
	if (mask == 0)
		return 0;

	if (sbsp->smk_flags & SMK_SB_UNTRUSTED) {
		if (smk_of_inode(inode) != sbsp->smk_root)
			return -EACCES;
	}

	/* May be droppable after audit */
	if (no_block)
		return -ECHILD;
	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
	smk_ad_setfield_u_fs_inode(&ad, inode);
	rc = smk_curacc(smk_of_inode(inode), mask, &ad);
	rc = smk_bu_inode(inode, mask, rc);
	return rc;
}

Project: linux
File: hooks.c

static void selinux_inet_csk_clone(struct sock *newsk,
				   const struct request_sock *req)
{
	struct sk_security_struct *newsksec = newsk->sk_security;

	newsksec->sid = req->secid;
	newsksec->peer_sid = req->peer_secid;
	/* NOTE: Ideally, we should also get the isec->sid for the
	   new socket in sync, but we don't have the isec available yet.
	   So we will wait until sock_graft to do it, by which
	   time it will have been created and available. */

	/* We don't need to take any sort of lock here as we are the only
	 * thread with access to newsksec */
	selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family);
}

Project: linux
File: hooks.c

static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
{
	if (!sk)
		*secid = SECINITSID_ANY_SOCKET;
	else {
		struct sk_security_struct *sksec = sk->sk_security;

		*secid = sksec->sid;
	}
}

Project: linux

static u32 ptrace_parent_sid(void)
{
	u32 sid = 0;
	struct task_struct *tracer;

	rcu_read_lock();
	tracer = ptrace_parent(current);
	if (tracer)
		sid = task_sid_obj(tracer);
	rcu_read_unlock();

	return sid;
}

Project: linux

static int smack_sb_alloc_security(struct super_block *sb)
{
	struct superblock_smack *sbsp = smack_superblock(sb);

	sbsp->smk_root = &smack_known_floor;
	sbsp->smk_default = &smack_known_floor;
	sbsp->smk_floor = &smack_known_floor;
	sbsp->smk_hat = &smack_known_hat;
	/*
	 * SMK_SB_INITIALIZED will be zero from kzalloc.
	 */

	return 0;
}

Project: linux

static int selinux_inode_permission(struct inode *inode, int mask)
{
	const struct cred *cred = current_cred();
	u32 perms;
	bool from_access;
	bool no_block = mask & MAY_NOT_BLOCK;
	struct inode_security_struct *isec;
	u32 sid;
	struct av_decision avd;
	int rc, rc2;
	u32 audited, denied;

	from_access = mask & MAY_ACCESS;
	mask &= (MAY_READ|MAY_WRITE|MAY_EXEC|MAY_APPEND);

	/* No permission to check.  Existence test. */
	if (!mask)
		return 0;

	validate_creds(cred);

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	perms = file_mask_to_av(inode->i_mode, mask);

	sid = cred_sid(cred);
	isec = inode_security_rcu(inode, no_block);
	if (IS_ERR(isec))
		return PTR_ERR(isec);

	rc = avc_has_perm_noaudit(&selinux_state,
				  sid, isec->sid, isec->sclass, perms, 0,
				  &avd);
	audited = avc_audit_required(perms, &avd, rc,
				     from_access ? FILE__AUDIT_ACCESS : 0,
				     &denied);
	if (likely(!audited))
		return rc;

	rc2 = audit_inode_permission(inode, perms, audited, denied, rc);
	if (rc2)
		return rc2;
	return rc;
}

Project: linux

static int smack_shm_shmat(struct kern_ipc_perm *isp, char __user *shmaddr,
			   int shmflg)
{
	int may;

	may = smack_flags_to_may(shmflg);
	return smk_curacc_shm(isp, may);
}

Project: linux

static int inode_doinit_with_dentry(struct inode *inode, struct dentry *opt_dentry)
{
	struct superblock_security_struct *sbsec = NULL;
	struct inode_security_struct *isec = selinux_inode(inode);
	u32 task_sid, sid = 0;
	u16 sclass;
	struct dentry *dentry;
	int rc = 0;

	if (isec->initialized == LABEL_INITIALIZED)
		return 0;

	spin_lock(&isec->lock);
	if (isec->initialized == LABEL_INITIALIZED)
		goto out_unlock;

	if (isec->sclass == SECCLASS_FILE)
		isec->sclass = inode_mode_to_security_class(inode->i_mode);

	sbsec = selinux_superblock(inode->i_sb);
	if (!(sbsec->flags & SE_SBINITIALIZED)) {
		/* Defer initialization until selinux_complete_init,
		   after the initial policy is loaded and the security
		   server is ready to handle calls. */
		spin_lock(&sbsec->isec_lock);
		if (list_empty(&isec->list))
			list_add(&isec->list, &sbsec->isec_head);
		spin_unlock(&sbsec->isec_lock);
		goto out_unlock;
	}

	sclass = isec->sclass;
	task_sid = isec->task_sid;
	sid = isec->sid;
	isec->initialized = LABEL_PENDING;
	spin_unlock(&isec->lock);

	switch (sbsec->behavior) {
	case SECURITY_FS_USE_NATIVE:
		break;
	case SECURITY_FS_USE_XATTR:
		if (!(inode->i_opflags & IOP_XATTR)) {
			sid = sbsec->def_sid;
			break;
		}
		/* Need a dentry, since the xattr API requires one.
		   Life would be simpler if we could just pass the inode. */
		if (opt_dentry) {
			/* Called from d_instantiate or d_splice_alias. */
			dentry = dget(opt_dentry);
		} else {
			/*
			 * Called from selinux_complete_init, try to find a dentry.
			 * Some filesystems really want a connected one, so try
			 * that first.  We could split SECURITY_FS_USE_XATTR in
			 * two, depending upon that...
			 */
			dentry = d_find_alias(inode);
			if (!dentry)
				dentry = d_find_any_alias(inode);
		}
		if (!dentry) {
			/*
			 * this is can be hit on boot when a file is accessed
			 * before the policy is loaded.  When we load policy we
			 * may find inodes that have no dentry on the
			 * sbsec->isec_head list.  No reason to complain as these
			 * will get fixed up the next time we go through
			 * inode_doinit with a dentry, before these inodes could
			 * be used again by userspace.
			 */
			goto out_invalid;
		}

		rc = inode_doinit_use_xattr(inode, dentry, sbsec->def_sid,
					    &sid);
		dput(dentry);
		if (rc)
			goto out;
		break;
	case SECURITY_FS_USE_TASK:
		sid = task_sid;
		break;
	case SECURITY_FS_USE_TRANS:
		/* Default to the fs SID. */
		sid = sbsec->sid;

		/* Try to obtain a transition SID. */
		rc = security_transition_sid(&selinux_state, task_sid, sid,
					     sclass, NULL, &sid);
		if (rc)
			goto out;
		break;
	case SECURITY_FS_USE_MNTPOINT:
		sid = sbsec->mntpoint_sid;
		break;
	default:
		/* Default to the fs superblock SID. */
		sid = sbsec->sid;

		if ((sbsec->flags & SE_SBGENFS) &&
		     (!S_ISLNK(inode->i_mode) ||
		      selinux_policycap_genfs_seclabel_symlinks())) {
			/* We must have a dentry to determine the label on
			 * procfs inodes */
			if (opt_dentry) {
				/* Called from d_instantiate or
				 * d_splice_alias. */
				dentry = dget(opt_dentry);
			} else {
				/* Called from selinux_complete_init, try to
				 * find a dentry.  Some filesystems really want
				 * a connected one, so try that first.
				 */
				dentry = d_find_alias(inode);
				if (!dentry)
					dentry = d_find_any_alias(inode);
			}
			/*
			 * This can be hit on boot when a file is accessed
			 * before the policy is loaded.  When we load policy we
			 * may find inodes that have no dentry on the
			 * sbsec->isec_head list.  No reason to complain as
			 * these will get fixed up the next time we go through
			 * inode_doinit() with a dentry, before these inodes
			 * could be used again by userspace.
			 */
			if (!dentry)
				goto out_invalid;
			rc = selinux_genfs_get_sid(dentry, sclass,
						   sbsec->flags, &sid);
			if (rc) {
				dput(dentry);
				goto out;
			}

			if ((sbsec->flags & SE_SBGENFS_XATTR) &&
			    (inode->i_opflags & IOP_XATTR)) {
				rc = inode_doinit_use_xattr(inode, dentry,
							    sid, &sid);
				if (rc) {
					dput(dentry);
					goto out;
				}
			}
			dput(dentry);
		}
		break;
	}

out:
	spin_lock(&isec->lock);
	if (isec->initialized == LABEL_PENDING) {
		if (rc) {
			isec->initialized = LABEL_INVALID;
			goto out_unlock;
		}
		isec->initialized = LABEL_INITIALIZED;
		isec->sid = sid;
	}

out_unlock:
	spin_unlock(&isec->lock);
	return rc;

out_invalid:
	spin_lock(&isec->lock);
	if (isec->initialized == LABEL_PENDING) {
		isec->initialized = LABEL_INVALID;
		isec->sid = sid;
	}
	spin_unlock(&isec->lock);
	return 0;
}

Project: linux
File: hooks.c

static struct inode_security_struct *inode_security_rcu(struct inode *inode, bool rcu)
{
	int error;

	error = __inode_security_revalidate(inode, NULL, !rcu);
	if (error)
		return ERR_PTR(error);
	return selinux_inode(inode);
}

Project: linux
File: hooks.c

static inline int path_has_perm(const struct cred *cred,
				const struct path *path,
				u32 av)
{
	struct inode *inode = d_backing_inode(path->dentry);
	struct common_audit_data ad;

	ad.type = LSM_AUDIT_DATA_PATH;
	ad.u.path = *path;
	__inode_security_revalidate(inode, path->dentry, true);
	return inode_has_perm(cred, inode, av, &ad);
}

Project: linux
File: hooks.c

static int selinux_shm_shmctl(struct kern_ipc_perm *shp, int cmd)
{
	int perms;
	int err;

	switch (cmd) {
	case IPC_INFO:
	case SHM_INFO:
		/* No specific object, just general system-wide information. */
		return avc_has_perm(&selinux_state,
				    current_sid(), SECINITSID_KERNEL,
				    SECCLASS_SYSTEM, SYSTEM__IPC_INFO, NULL);
	case IPC_STAT:
	case SHM_STAT:
	case SHM_STAT_ANY:
		perms = SHM__GETATTR | SHM__ASSOCIATE;
		break;
	case IPC_SET:
		perms = SHM__SETATTR;
		break;
	case SHM_LOCK:
	case SHM_UNLOCK:
		perms = SHM__LOCK;
		break;
	case IPC_RMID:
		perms = SHM__DESTROY;
		break;
	default:
		return 0;
	}

	err = ipc_has_perm(shp, perms);
	return err;
}

Project: linux
File: hooks.c

static int selinux_socket_unix_may_send(struct socket *sock,
					struct socket *other)
{
	struct sk_security_struct *ssec = sock->sk->sk_security;
	struct sk_security_struct *osec = other->sk->sk_security;
	struct common_audit_data ad;
	struct lsm_network_audit net = {0,};

	ad.type = LSM_AUDIT_DATA_NET;
	ad.u.net = &net;
	ad.u.net->sk = other->sk;

	return avc_has_perm(&selinux_state,
			    ssec->sid, osec->sid, osec->sclass, SOCKET__SENDTO,
			    &ad);
}

Project: linux
File: hooks.c

static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
	int err;
	struct sk_security_struct *sksec = sk->sk_security;
	u16 family = sk->sk_family;
	u32 sk_sid = sksec->sid;
	struct common_audit_data ad;
	struct lsm_network_audit net = {0,};
	char *addrp;
	u8 secmark_active;
	u8 peerlbl_active;

	if (family != PF_INET && family != PF_INET6)
		return 0;

	/* Handle mapped IPv4 packets arriving via IPv6 sockets */
	if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
		family = PF_INET;

	/* If any sort of compatibility mode is enabled then handoff processing
	 * to the selinux_sock_rcv_skb_compat() function to deal with the
	 * special handling.  We do this in an attempt to keep this function
	 * as fast and as clean as possible. */
	if (!selinux_policycap_netpeer())
		return selinux_sock_rcv_skb_compat(sk, skb, family);

	secmark_active = selinux_secmark_enabled();
	peerlbl_active = selinux_peerlbl_enabled();
	if (!secmark_active && !peerlbl_active)
		return 0;

	ad.type = LSM_AUDIT_DATA_NET;
	ad.u.net = &net;
	ad.u.net->netif = skb->skb_iif;
	ad.u.net->family = family;
	err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
	if (err)
		return err;

	if (peerlbl_active) {
		u32 peer_sid;

		err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
		if (err)
			return err;
		err = selinux_inet_sys_rcv_skb(sock_net(sk), skb->skb_iif,
					       addrp, family, peer_sid, &ad);
		if (err) {
			selinux_netlbl_err(skb, family, err, 0);
			return err;
		}
		err = avc_has_perm(&selinux_state,
				   sk_sid, peer_sid, SECCLASS_PEER,
				   PEER__RECV, &ad);
		if (err) {
			selinux_netlbl_err(skb, family, err, 0);
			return err;
		}
	}

	if (secmark_active) {
		err = avc_has_perm(&selinux_state,
				   sk_sid, skb->secmark, SECCLASS_PACKET,
				   PACKET__RECV, &ad);
		if (err)
			return err;
	}

	return err;
}

Project: linux

static int selinux_task_setioprio(struct task_struct *p, int ioprio)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
			    PROCESS__SETSCHED, NULL);
}

Project: linux
File: hooks.c

static int selinux_inode_create(struct inode *dir, struct dentry *dentry, umode_t mode)
{
	return may_create(dir, dentry, SECCLASS_FILE);
}

Project: linux
File: hooks.c

static void selinux_inode_free_security(struct inode *inode)
{
	inode_free_security(inode);
}

Project: linux

static void selinux_task_getsecid_obj(struct task_struct *p, u32 *secid)
{
	*secid = task_sid_obj(p);
}

Project: linux
File: hooks.c

static int selinux_getprocattr(struct task_struct *p,
			       char *name, char **value)
{
	const struct task_security_struct *__tsec;
	u32 sid;
	int error;
	unsigned len;

	rcu_read_lock();
	__tsec = selinux_cred(__task_cred(p));

	if (current != p) {
		error = avc_has_perm(&selinux_state,
				     current_sid(), __tsec->sid,
				     SECCLASS_PROCESS, PROCESS__GETATTR, NULL);
		if (error)
			goto bad;
	}

	if (!strcmp(name, "current"))
		sid = __tsec->sid;
	else if (!strcmp(name, "prev"))
		sid = __tsec->osid;
	else if (!strcmp(name, "exec"))
		sid = __tsec->exec_sid;
	else if (!strcmp(name, "fscreate"))
		sid = __tsec->create_sid;
	else if (!strcmp(name, "keycreate"))
		sid = __tsec->keycreate_sid;
	else if (!strcmp(name, "sockcreate"))
		sid = __tsec->sockcreate_sid;
	else {
		error = -EINVAL;
		goto bad;
	}
	rcu_read_unlock();

	if (!sid)
		return 0;

	error = security_sid_to_context(&selinux_state, sid, value, &len);
	if (error)
		return error;
	return len;

bad:
	rcu_read_unlock();
	return error;
}

Project: linux
File: hooks.c

static int selinux_socket_connect_helper(struct socket *sock,
					 struct sockaddr *address, int addrlen)
{
	struct sock *sk = sock->sk;
	struct sk_security_struct *sksec = sk->sk_security;
	int err;

	err = sock_has_perm(sk, SOCKET__CONNECT);
	if (err)
		return err;
	if (addrlen < offsetofend(struct sockaddr, sa_family))
		return -EINVAL;

	/* connect(AF_UNSPEC) has special handling, as it is a documented
	 * way to disconnect the socket
	 */
	if (address->sa_family == AF_UNSPEC)
		return 0;

	/*
	 * If a TCP, DCCP or SCTP socket, check name_connect permission
	 * for the port.
	 */
	if (sksec->sclass == SECCLASS_TCP_SOCKET ||
	    sksec->sclass == SECCLASS_DCCP_SOCKET ||
	    sksec->sclass == SECCLASS_SCTP_SOCKET) {
		struct common_audit_data ad;
		struct lsm_network_audit net = {0,};
		struct sockaddr_in *addr4 = NULL;
		struct sockaddr_in6 *addr6 = NULL;
		unsigned short snum;
		u32 sid, perm;

		/* sctp_connectx(3) calls via selinux_sctp_bind_connect()
		 * that validates multiple connect addresses. Because of this
		 * need to check address->sa_family as it is possible to have
		 * sk->sk_family = PF_INET6 with addr->sa_family = AF_INET.
		 */
		switch (address->sa_family) {
		case AF_INET:
			addr4 = (struct sockaddr_in *)address;
			if (addrlen < sizeof(struct sockaddr_in))
				return -EINVAL;
			snum = ntohs(addr4->sin_port);
			break;
		case AF_INET6:
			addr6 = (struct sockaddr_in6 *)address;
			if (addrlen < SIN6_LEN_RFC2133)
				return -EINVAL;
			snum = ntohs(addr6->sin6_port);
			break;
		default:
			/* Note that SCTP services expect -EINVAL, whereas
			 * others expect -EAFNOSUPPORT.
			 */
			if (sksec->sclass == SECCLASS_SCTP_SOCKET)
				return -EINVAL;
			else
				return -EAFNOSUPPORT;
		}

		err = sel_netport_sid(sk->sk_protocol, snum, &sid);
		if (err)
			return err;

		switch (sksec->sclass) {
		case SECCLASS_TCP_SOCKET:
			perm = TCP_SOCKET__NAME_CONNECT;
			break;
		case SECCLASS_DCCP_SOCKET:
			perm = DCCP_SOCKET__NAME_CONNECT;
			break;
		case SECCLASS_SCTP_SOCKET:
			perm = SCTP_SOCKET__NAME_CONNECT;
			break;
		}

		ad.type = LSM_AUDIT_DATA_NET;
		ad.u.net = &net;
		ad.u.net->dport = htons(snum);
		ad.u.net->family = address->sa_family;
		err = avc_has_perm(&selinux_state,
				   sksec->sid, sid, sksec->sclass, perm, &ad);
		if (err)
			return err;
	}

	return 0;
}

Project: linux
File: hooks.c

static int selinux_quotactl(int cmds, int type, int id, struct super_block *sb)
{
	const struct cred *cred = current_cred();
	int rc = 0;

	if (!sb)
		return 0;

	switch (cmds) {
	case Q_SYNC:
	case Q_QUOTAON:
	case Q_QUOTAOFF:
	case Q_SETINFO:
	case Q_SETQUOTA:
	case Q_XQUOTAOFF:
	case Q_XQUOTAON:
	case Q_XSETQLIM:
		rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAMOD, NULL);
		break;
	case Q_GETFMT:
	case Q_GETINFO:
	case Q_GETQUOTA:
	case Q_XGETQUOTA:
	case Q_XGETQSTAT:
	case Q_XGETQSTATV:
	case Q_XGETNEXTQUOTA:
		rc = superblock_has_perm(cred, sb, FILESYSTEM__QUOTAGET, NULL);
		break;
	default:
		rc = 0;  /* let the kernel handle invalid cmds */
		break;
	}
	return rc;
}

Project: linux
File: hooks.c

static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
{
	struct sk_security_struct *sksec = sk->sk_security;
	struct sk_security_struct *newsksec = newsk->sk_security;

	newsksec->sid = sksec->sid;
	newsksec->peer_sid = sksec->peer_sid;
	newsksec->sclass = sksec->sclass;

	selinux_netlbl_sk_security_reset(newsksec);
}

Project: linux
File: hooks.c

static int selinux_kernel_act_as(struct cred *new, u32 secid)
{
	struct task_security_struct *tsec = selinux_cred(new);
	u32 sid = current_sid();
	int ret;

	ret = avc_has_perm(&selinux_state,
			   sid, secid,
			   SECCLASS_KERNEL_SERVICE,
			   KERNEL_SERVICE__USE_AS_OVERRIDE,
			   NULL);
	if (ret == 0) {
		tsec->sid = secid;
		tsec->create_sid = 0;
		tsec->keycreate_sid = 0;
		tsec->sockcreate_sid = 0;
	}
	return ret;
}

Project: linux

static int smack_inode_setsecurity(struct inode *inode, const char *name,
				   const void *value, size_t size, int flags)
{
	struct smack_known *skp;
	struct inode_smack *nsp = smack_inode(inode);
	struct socket_smack *ssp;
	struct socket *sock;
	int rc = 0;

	if (value == NULL || size > SMK_LONGLABEL || size == 0)
		return -EINVAL;

	skp = smk_import_entry(value, size);
	if (IS_ERR(skp))
		return PTR_ERR(skp);

	if (strcmp(name, XATTR_SMACK_SUFFIX) == 0) {
		nsp->smk_inode = skp;
		nsp->smk_flags |= SMK_INODE_INSTANT;
		return 0;
	}
	/*
	 * The rest of the Smack xattrs are only on sockets.
	 */
	if (inode->i_sb->s_magic != SOCKFS_MAGIC)
		return -EOPNOTSUPP;

	sock = SOCKET_I(inode);
	if (sock == NULL || sock->sk == NULL)
		return -EOPNOTSUPP;

	ssp = sock->sk->sk_security;

	if (strcmp(name, XATTR_SMACK_IPIN) == 0)
		ssp->smk_in = skp;
	else if (strcmp(name, XATTR_SMACK_IPOUT) == 0) {
		ssp->smk_out = skp;
		if (sock->sk->sk_family == PF_INET) {
			rc = smack_netlbl_add(sock->sk);
			if (rc != 0)
				printk(KERN_WARNING
					"Smack: \"%s\" netlbl error %d.\n",
					__func__, -rc);
		}
	} else
		return -EOPNOTSUPP;

#ifdef SMACK_IPV6_PORT_LABELING
	if (sock->sk->sk_family == PF_INET6)
		smk_ipv6_port_label(sock, NULL);
#endif

	return 0;
}

Project: linux

static void smack_sock_graft(struct sock *sk, struct socket *parent)
{
	struct socket_smack *ssp;
	struct smack_known *skp = smk_of_current();

	if (sk == NULL ||
	    (sk->sk_family != PF_INET && sk->sk_family != PF_INET6))
		return;

	ssp = sk->sk_security;
	ssp->smk_in = skp;
	ssp->smk_out = skp;
	/* cssp->smk_packet is already set in smack_inet_csk_clone() */
}

Project: linux
File: hooks.c

static bool has_cap_mac_admin(bool audit)
{
	const struct cred *cred = current_cred();
	unsigned int opts = audit ? CAP_OPT_NONE : CAP_OPT_NOAUDIT;

	if (cap_capable(cred, &init_user_ns, CAP_MAC_ADMIN, opts))
		return false;
	if (cred_has_capability(cred, CAP_MAC_ADMIN, opts, true))
		return false;
	return true;
}

Project: linux

static int may_create(struct inode *dir,
		      struct dentry *dentry,
		      u16 tclass)
{
	const struct task_security_struct *tsec = selinux_cred(current_cred());
	struct inode_security_struct *dsec;
	struct superblock_security_struct *sbsec;
	u32 sid, newsid;
	struct common_audit_data ad;
	int rc;

	dsec = inode_security(dir);
	sbsec = selinux_superblock(dir->i_sb);

	sid = tsec->sid;

	ad.type = LSM_AUDIT_DATA_DENTRY;
	ad.u.dentry = dentry;

	rc = avc_has_perm(&selinux_state,
			  sid, dsec->sid, SECCLASS_DIR,
			  DIR__ADD_NAME | DIR__SEARCH,
			  &ad);
	if (rc)
		return rc;

	rc = selinux_determine_inode_label(tsec, dir, &dentry->d_name, tclass,
					   &newsid);
	if (rc)
		return rc;

	rc = avc_has_perm(&selinux_state,
			  sid, newsid, tclass, FILE__CREATE, &ad);
	if (rc)
		return rc;

	return avc_has_perm(&selinux_state,
			    newsid, sbsec->sid,
			    SECCLASS_FILESYSTEM,
			    FILESYSTEM__ASSOCIATE, &ad);
}

Project: linux

static int selinux_mmap_file(struct file *file, unsigned long reqprot,
			     unsigned long prot, unsigned long flags)
{
	struct common_audit_data ad;
	int rc;

	if (file) {
		ad.type = LSM_AUDIT_DATA_FILE;
		ad.u.file = file;
		rc = inode_has_perm(current_cred(), file_inode(file),
				    FILE__MAP, &ad);
		if (rc)
			return rc;
	}

	if (checkreqprot_get(&selinux_state))
		prot = reqprot;

	return file_map_prot_check(file, prot,
				   (flags & MAP_TYPE) == MAP_SHARED);
}

Project: linux
File: hooks.c

static int selinux_bpf_prog_alloc(struct bpf_prog_aux *aux)
{
	struct bpf_security_struct *bpfsec;

	bpfsec = kzalloc(sizeof(*bpfsec), GFP_KERNEL);
	if (!bpfsec)
		return -ENOMEM;

	bpfsec->sid = current_sid();
	aux->security = bpfsec;

	return 0;
}

Project: linux

static struct smack_known *smack_from_secattr(struct netlbl_lsm_secattr *sap,
						struct socket_smack *ssp)
{
	struct smack_known *skp;
	int found = 0;
	int acat;
	int kcat;

	/*
	 * Netlabel found it in the cache.
	 */
	if ((sap->flags & NETLBL_SECATTR_CACHE) != 0)
		return (struct smack_known *)sap->cache->data;

	if ((sap->flags & NETLBL_SECATTR_SECID) != 0)
		/*
		 * Looks like a fallback, which gives us a secid.
		 */
		return smack_from_secid(sap->attr.secid);

	if ((sap->flags & NETLBL_SECATTR_MLS_LVL) != 0) {
		/*
		 * Looks like a CIPSO packet.
		 * If there are flags but no level netlabel isn't
		 * behaving the way we expect it to.
		 *
		 * Look it up in the label table
		 * Without guidance regarding the smack value
		 * for the packet fall back on the network
		 * ambient value.
		 */
		rcu_read_lock();
		list_for_each_entry_rcu(skp, &smack_known_list, list) {
			if (sap->attr.mls.lvl != skp->smk_netlabel.attr.mls.lvl)
				continue;
			/*
			 * Compare the catsets. Use the netlbl APIs.
			 */
			if ((sap->flags & NETLBL_SECATTR_MLS_CAT) == 0) {
				if ((skp->smk_netlabel.flags &
				     NETLBL_SECATTR_MLS_CAT) == 0)
					found = 1;
				break;
			}
			for (acat = -1, kcat = -1; acat == kcat; ) {
				acat = netlbl_catmap_walk(sap->attr.mls.cat,
							  acat + 1);
				kcat = netlbl_catmap_walk(
					skp->smk_netlabel.attr.mls.cat,
					kcat + 1);
				if (acat < 0 || kcat < 0)
					break;
			}
			if (acat == kcat) {
				found = 1;
				break;
			}
		}
		rcu_read_unlock();

		if (found)
			return skp;

		if (ssp != NULL && ssp->smk_in == &smack_known_star)
			return &smack_known_web;
		return &smack_known_star;
	}
	/*
	 * Without guidance regarding the smack value
	 * for the packet fall back on the network
	 * ambient value.
	 */
	return smack_net_ambient;
}

Project: linux

static int selinux_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
				     struct request_sock *req)
{
	struct sk_security_struct *sksec = sk->sk_security;
	int err;
	u16 family = req->rsk_ops->family;
	u32 connsid;
	u32 peersid;

	err = selinux_skb_peerlbl_sid(skb, family, &peersid);
	if (err)
		return err;
	err = selinux_conn_sid(sksec->sid, peersid, &connsid);
	if (err)
		return err;
	req->secid = connsid;
	req->peer_secid = peersid;

	return selinux_netlbl_inet_conn_request(req, family);
}

Project: linux
File: hooks.c

static unsigned int selinux_ipv6_forward(void *priv,
					 struct sk_buff *skb,
					 const struct nf_hook_state *state)
{
	return selinux_ip_forward(skb, state->in, PF_INET6);
}

Project: linux
File: hooks.c

static int selinux_inode_unlink(struct inode *dir, struct dentry *dentry)
{
	return may_link(dir, dentry, MAY_UNLINK);
}

Project: linux

static int smack_inode_getxattr(struct dentry *dentry, const char *name)
{
	struct smk_audit_info ad;
	int rc;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
	smk_ad_setfield_u_fs_path_dentry(&ad, dentry);

	rc = smk_curacc(smk_of_inode(d_backing_inode(dentry)), MAY_READ, &ad);
	rc = smk_bu_inode(d_backing_inode(dentry), MAY_READ, rc);
	return rc;
}

Project: linux

static int smack_socket_post_create(struct socket *sock, int family,
				    int type, int protocol, int kern)
{
	struct socket_smack *ssp;

	if (sock->sk == NULL)
		return 0;

	/*
	 * Sockets created by kernel threads receive web label.
	 */
	if (unlikely(current->flags & PF_KTHREAD)) {
		ssp = sock->sk->sk_security;
		ssp->smk_in = &smack_known_web;
		ssp->smk_out = &smack_known_web;
	}

	if (family != PF_INET)
		return 0;
	/*
	 * Set the outbound netlbl.
	 */
	return smack_netlbl_add(sock->sk);
}

Project: linux
File: hooks.c

static int selinux_socket_listen(struct socket *sock, int backlog)
{
	return sock_has_perm(sock->sk, SOCKET__LISTEN);
}

Project: linux
File: hooks.c

static int file_has_perm(const struct cred *cred,
			 struct file *file,
			 u32 av)
{
	struct file_security_struct *fsec = selinux_file(file);
	struct inode *inode = file_inode(file);
	struct common_audit_data ad;
	u32 sid = cred_sid(cred);
	int rc;

	ad.type = LSM_AUDIT_DATA_FILE;
	ad.u.file = file;

	if (sid != fsec->sid) {
		rc = avc_has_perm(&selinux_state,
				  sid, fsec->sid,
				  SECCLASS_FD,
				  FD__USE,
				  &ad);
		if (rc)
			goto out;
	}

#ifdef CONFIG_BPF_SYSCALL
	rc = bpf_fd_pass(file, cred_sid(cred));
	if (rc)
		return rc;
#endif

	/* av is zero if only checking access to the descriptor. */
	rc = 0;
	if (av)
		rc = inode_has_perm(cred, inode, av, &ad);

out:
	return rc;
}

Project: linux

static int smack_dentry_create_files_as(struct dentry *dentry, int mode,
					struct qstr *name,
					const struct cred *old,
					struct cred *new)
{
	struct task_smack *otsp = smack_cred(old);
	struct task_smack *ntsp = smack_cred(new);
	struct inode_smack *isp;
	int may;

	/*
	 * Use the process credential unless all of
	 * the transmuting criteria are met
	 */
	ntsp->smk_task = otsp->smk_task;

	/*
	 * the attribute of the containing directory
	 */
	isp = smack_inode(d_inode(dentry->d_parent));

	if (isp->smk_flags & SMK_INODE_TRANSMUTE) {
		rcu_read_lock();
		may = smk_access_entry(otsp->smk_task->smk_known,
				       isp->smk_inode->smk_known,
				       &otsp->smk_task->smk_rules);
		rcu_read_unlock();

		/*
		 * If the directory is transmuting and the rule
		 * providing access is transmuting use the containing
		 * directory label instead of the process label.
		 */
		if (may > 0 && (may & MAY_TRANSMUTE))
			ntsp->smk_task = isp->smk_inode;
	}
	return 0;
}

Project: linux

static int selinux_file_send_sigiotask(struct task_struct *tsk,
				       struct fown_struct *fown, int signum)
{
	struct file *file;
	u32 sid = task_sid_obj(tsk);
	u32 perm;
	struct file_security_struct *fsec;

	/* struct fown_struct is never outside the context of a struct file */
	file = container_of(fown, struct file, f_owner);

	fsec = selinux_file(file);

	if (!signum)
		perm = signal_to_av(SIGIO); /* as per send_sigio_to_task */
	else
		perm = signal_to_av(signum);

	return avc_has_perm(&selinux_state,
			    fsec->fown_sid, sid,
			    SECCLASS_PROCESS, perm, NULL);
}

Project: linux
File: hooks.c

static inline int opt_len(const char *s)
{
	bool open_quote = false;
	int len;
	char c;

	for (len = 0; (c = s[len]) != '\0'; len++) {
		if (c == '"')
			open_quote = !open_quote;
		if (c == ',' && !open_quote)
			break;
	}
	return len;
}

Project: linux
File: hooks.c

static int selinux_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
{
	int rc = selinux_inode_setsecurity(inode, XATTR_SELINUX_SUFFIX,
					   ctx, ctxlen, 0);
	/* Do not return error when suppressing label (SBLABEL_MNT not set). */
	return rc == -EOPNOTSUPP ? 0 : rc;
}

Project: linux

static int selinux_sb_clone_mnt_opts(const struct super_block *oldsb,
					struct super_block *newsb,
					unsigned long kern_flags,
					unsigned long *set_kern_flags)
{
	int rc = 0;
	const struct superblock_security_struct *oldsbsec =
						selinux_superblock(oldsb);
	struct superblock_security_struct *newsbsec = selinux_superblock(newsb);

	int set_fscontext =	(oldsbsec->flags & FSCONTEXT_MNT);
	int set_context =	(oldsbsec->flags & CONTEXT_MNT);
	int set_rootcontext =	(oldsbsec->flags & ROOTCONTEXT_MNT);

	/*
	 * if the parent was able to be mounted it clearly had no special lsm
	 * mount options.  thus we can safely deal with this superblock later
	 */
	if (!selinux_initialized(&selinux_state))
		return 0;

	/*
	 * Specifying internal flags without providing a place to
	 * place the results is not allowed.
	 */
	if (kern_flags && !set_kern_flags)
		return -EINVAL;

	/* how can we clone if the old one wasn't set up?? */
	BUG_ON(!(oldsbsec->flags & SE_SBINITIALIZED));

	/* if fs is reusing a sb, make sure that the contexts match */
	if (newsbsec->flags & SE_SBINITIALIZED) {
		if ((kern_flags & SECURITY_LSM_NATIVE_LABELS) && !set_context)
			*set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
		return selinux_cmp_sb_context(oldsb, newsb);
	}

	mutex_lock(&newsbsec->lock);

	newsbsec->flags = oldsbsec->flags;

	newsbsec->sid = oldsbsec->sid;
	newsbsec->def_sid = oldsbsec->def_sid;
	newsbsec->behavior = oldsbsec->behavior;

	if (newsbsec->behavior == SECURITY_FS_USE_NATIVE &&
		!(kern_flags & SECURITY_LSM_NATIVE_LABELS) && !set_context) {
		rc = security_fs_use(&selinux_state, newsb);
		if (rc)
			goto out;
	}

	if (kern_flags & SECURITY_LSM_NATIVE_LABELS && !set_context) {
		newsbsec->behavior = SECURITY_FS_USE_NATIVE;
		*set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
	}

	if (set_context) {
		u32 sid = oldsbsec->mntpoint_sid;

		if (!set_fscontext)
			newsbsec->sid = sid;
		if (!set_rootcontext) {
			struct inode_security_struct *newisec = backing_inode_security(newsb->s_root);
			newisec->sid = sid;
		}
		newsbsec->mntpoint_sid = sid;
	}
	if (set_rootcontext) {
		const struct inode_security_struct *oldisec = backing_inode_security(oldsb->s_root);
		struct inode_security_struct *newisec = backing_inode_security(newsb->s_root);

		newisec->sid = oldisec->sid;
	}

	sb_finish_set_opts(newsb);
out:
	mutex_unlock(&newsbsec->lock);
	return rc;
}

Project: linux

static int smack_task_getscheduler(struct task_struct *p)
{
	return smk_curacc_on_task(p, MAY_READ, __func__);
}

Project: linux

static __init int selinux_init(void)
{
	pr_info("SELinux:  Initializing.\n");

	memset(&selinux_state, 0, sizeof(selinux_state));
	enforcing_set(&selinux_state, selinux_enforcing_boot);
	checkreqprot_set(&selinux_state, selinux_checkreqprot_boot);
	selinux_avc_init(&selinux_state.avc);
	mutex_init(&selinux_state.status_lock);
	mutex_init(&selinux_state.policy_mutex);

	/* Set the security state for the initial task. */
	cred_init_security();

	default_noexec = !(VM_DATA_DEFAULT_FLAGS & VM_EXEC);

	avc_init();

	avtab_cache_init();

	ebitmap_cache_init();

	hashtab_cache_init();

	security_add_hooks(selinux_hooks, ARRAY_SIZE(selinux_hooks), "selinux");

	if (avc_add_callback(selinux_netcache_avc_callback, AVC_CALLBACK_RESET))
		panic("SELinux: Unable to register AVC netcache callback\n");

	if (avc_add_callback(selinux_lsm_notifier_avc_callback, AVC_CALLBACK_RESET))
		panic("SELinux: Unable to register AVC LSM notifier callback\n");

	if (selinux_enforcing_boot)
		pr_debug("SELinux:  Starting in enforcing mode\n");
	else
		pr_debug("SELinux:  Starting in permissive mode\n");

	fs_validate_description("selinux", selinux_fs_parameters);

	return 0;
}

Project: linux
File: hooks.c

static void selinux_ib_free_security(void *ib_sec)
{
	kfree(ib_sec);
}

Project: linux
File: hooks.c

static int selinux_socket_post_create(struct socket *sock, int family,
				      int type, int protocol, int kern)
{
	const struct task_security_struct *tsec = selinux_cred(current_cred());
	struct inode_security_struct *isec = inode_security_novalidate(SOCK_INODE(sock));
	struct sk_security_struct *sksec;
	u16 sclass = socket_type_to_security_class(family, type, protocol);
	u32 sid = SECINITSID_KERNEL;
	int err = 0;

	if (!kern) {
		err = socket_sockcreate_sid(tsec, sclass, &sid);
		if (err)
			return err;
	}

	isec->sclass = sclass;
	isec->sid = sid;
	isec->initialized = LABEL_INITIALIZED;

	if (sock->sk) {
		sksec = sock->sk->sk_security;
		sksec->sclass = sclass;
		sksec->sid = sid;
		/* Allows detection of the first association on this socket */
		if (sksec->sclass == SECCLASS_SCTP_SOCKET)
			sksec->sctp_assoc_state = SCTP_ASSOC_UNSET;

		err = selinux_netlbl_socket_post_create(sock->sk, family);
	}

	return err;
}

Project: linux

static int selinux_sb_show_options(struct seq_file *m, struct super_block *sb)
{
	struct superblock_security_struct *sbsec = selinux_superblock(sb);
	int rc;

	if (!(sbsec->flags & SE_SBINITIALIZED))
		return 0;

	if (!selinux_initialized(&selinux_state))
		return 0;

	if (sbsec->flags & FSCONTEXT_MNT) {
		seq_putc(m, ',');
		seq_puts(m, FSCONTEXT_STR);
		rc = show_sid(m, sbsec->sid);
		if (rc)
			return rc;
	}
	if (sbsec->flags & CONTEXT_MNT) {
		seq_putc(m, ',');
		seq_puts(m, CONTEXT_STR);
		rc = show_sid(m, sbsec->mntpoint_sid);
		if (rc)
			return rc;
	}
	if (sbsec->flags & DEFCONTEXT_MNT) {
		seq_putc(m, ',');
		seq_puts(m, DEFCONTEXT_STR);
		rc = show_sid(m, sbsec->def_sid);
		if (rc)
			return rc;
	}
	if (sbsec->flags & ROOTCONTEXT_MNT) {
		struct dentry *root = sb->s_root;
		struct inode_security_struct *isec = backing_inode_security(root);
		seq_putc(m, ',');
		seq_puts(m, ROOTCONTEXT_STR);
		rc = show_sid(m, isec->sid);
		if (rc)
			return rc;
	}
	if (sbsec->flags & SBLABEL_MNT) {
		seq_putc(m, ',');
		seq_puts(m, SECLABEL_STR);
	}
	return 0;
}

Project: linux

static int smack_task_kill(struct task_struct *p, struct kernel_siginfo *info,
			   int sig, const struct cred *cred)
{
	struct smk_audit_info ad;
	struct smack_known *skp;
	struct smack_known *tkp = smk_of_task_struct_obj(p);
	int rc;

	if (!sig)
		return 0; /* null signal; existence test */

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
	smk_ad_setfield_u_tsk(&ad, p);
	/*
	 * Sending a signal requires that the sender
	 * can write the receiver.
	 */
	if (cred == NULL) {
		rc = smk_curacc(tkp, MAY_DELIVER, &ad);
		rc = smk_bu_task(p, MAY_DELIVER, rc);
		return rc;
	}
	/*
	 * If the cred isn't NULL we're dealing with some USB IO
	 * specific behavior. This is not clean. For one thing
	 * we can't take privilege into account.
	 */
	skp = smk_of_task(smack_cred(cred));
	rc = smk_access(skp, tkp, MAY_DELIVER, &ad);
	rc = smk_bu_note("USB signal", skp, tkp, MAY_DELIVER, rc);
	return rc;
}

Project: linux

static int smack_ipc_permission(struct kern_ipc_perm *ipp, short flag)
{
	struct smack_known **blob = smack_ipc(ipp);
	struct smack_known *iskp = *blob;
	int may = smack_flags_to_may(flag);
	struct smk_audit_info ad;
	int rc;

#ifdef CONFIG_AUDIT
	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
	ad.a.u.ipc_id = ipp->id;
#endif
	rc = smk_curacc(iskp, may, &ad);
	rc = smk_bu_current("svipc", iskp, may, rc);
	return rc;
}

Project: linux
File: hooks.c

static int selinux_parse_skb_ipv6(struct sk_buff *skb,
			struct common_audit_data *ad, u8 *proto)
{
	u8 nexthdr;
	int ret = -EINVAL, offset;
	struct ipv6hdr _ipv6h, *ip6;
	__be16 frag_off;

	offset = skb_network_offset(skb);
	ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
	if (ip6 == NULL)
		goto out;

	ad->u.net->v6info.saddr = ip6->saddr;
	ad->u.net->v6info.daddr = ip6->daddr;
	ret = 0;

	nexthdr = ip6->nexthdr;
	offset += sizeof(_ipv6h);
	offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
	if (offset < 0)
		goto out;

	if (proto)
		*proto = nexthdr;

	switch (nexthdr) {
	case IPPROTO_TCP: {
		struct tcphdr _tcph, *th;

		th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
		if (th == NULL)
			break;

		ad->u.net->sport = th->source;
		ad->u.net->dport = th->dest;
		break;
	}

	case IPPROTO_UDP: {
		struct udphdr _udph, *uh;

		uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
		if (uh == NULL)
			break;

		ad->u.net->sport = uh->source;
		ad->u.net->dport = uh->dest;
		break;
	}

	case IPPROTO_DCCP: {
		struct dccp_hdr _dccph, *dh;

		dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
		if (dh == NULL)
			break;

		ad->u.net->sport = dh->dccph_sport;
		ad->u.net->dport = dh->dccph_dport;
		break;
	}

#if IS_ENABLED(CONFIG_IP_SCTP)
	case IPPROTO_SCTP: {
		struct sctphdr _sctph, *sh;

		sh = skb_header_pointer(skb, offset, sizeof(_sctph), &_sctph);
		if (sh == NULL)
			break;

		ad->u.net->sport = sh->source;
		ad->u.net->dport = sh->dest;
		break;
	}
#endif
	/* includes fragments */
	default:
		break;
	}
out:
	return ret;
}

Project: linux
File: hooks.c

static int selinux_sem_alloc_security(struct kern_ipc_perm *sma)
{
	struct ipc_security_struct *isec;
	struct common_audit_data ad;
	u32 sid = current_sid();
	int rc;

	isec = selinux_ipc(sma);
	ipc_init_security(isec, SECCLASS_SEM);

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = sma->key;

	rc = avc_has_perm(&selinux_state,
			  sid, isec->sid, SECCLASS_SEM,
			  SEM__CREATE, &ad);
	return rc;
}

Project: linux

static int smack_task_getpgid(struct task_struct *p)
{
	return smk_curacc_on_task(p, MAY_READ, __func__);
}

Project: linux

static int smk_ipv4_check(struct sock *sk, struct sockaddr_in *sap)
{
	struct smack_known *skp;
	int rc = 0;
	struct smack_known *hkp;
	struct socket_smack *ssp = sk->sk_security;
	struct smk_audit_info ad;

	rcu_read_lock();
	hkp = smack_ipv4host_label(sap);
	if (hkp != NULL) {
#ifdef CONFIG_AUDIT
		struct lsm_network_audit net;

		smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
		ad.a.u.net->family = sap->sin_family;
		ad.a.u.net->dport = sap->sin_port;
		ad.a.u.net->v4info.daddr = sap->sin_addr.s_addr;
#endif
		skp = ssp->smk_out;
		rc = smk_access(skp, hkp, MAY_WRITE, &ad);
		rc = smk_bu_note("IPv4 host check", skp, hkp, MAY_WRITE, rc);
		/*
		 * Clear the socket netlabel if it's set.
		 */
		if (!rc)
			smack_netlbl_delete(sk);
	}
	rcu_read_unlock();

	return rc;
}

Project: linux
File: hooks.c

static void selinux_bprm_committing_creds(struct linux_binprm *bprm)
{
	struct task_security_struct *new_tsec;
	struct rlimit *rlim, *initrlim;
	int rc, i;

	new_tsec = selinux_cred(bprm->cred);
	if (new_tsec->sid == new_tsec->osid)
		return;

	/* Close files for which the new task SID is not authorized. */
	flush_unauthorized_files(bprm->cred, current->files);

	/* Always clear parent death signal on SID transitions. */
	current->pdeath_signal = 0;

	/* Check whether the new SID can inherit resource limits from the old
	 * SID.  If not, reset all soft limits to the lower of the current
	 * task's hard limit and the init task's soft limit.
	 *
	 * Note that the setting of hard limits (even to lower them) can be
	 * controlled by the setrlimit check.  The inclusion of the init task's
	 * soft limit into the computation is to avoid resetting soft limits
	 * higher than the default soft limit for cases where the default is
	 * lower than the hard limit, e.g. RLIMIT_CORE or RLIMIT_STACK.
	 */
	rc = avc_has_perm(&selinux_state,
			  new_tsec->osid, new_tsec->sid, SECCLASS_PROCESS,
			  PROCESS__RLIMITINH, NULL);
	if (rc) {
		/* protect against do_prlimit() */
		task_lock(current);
		for (i = 0; i < RLIM_NLIMITS; i++) {
			rlim = current->signal->rlim + i;
			initrlim = init_task.signal->rlim + i;
			rlim->rlim_cur = min(rlim->rlim_max, initrlim->rlim_cur);
		}
		task_unlock(current);
		if (IS_ENABLED(CONFIG_POSIX_TIMERS))
			update_rlimit_cpu(current, rlimit(RLIMIT_CPU));
	}
}

Project: linux
File: hooks.c

static void selinux_bpf_map_free(struct bpf_map *map)
{
	struct bpf_security_struct *bpfsec = map->security;

	map->security = NULL;
	kfree(bpfsec);
}

Project: linux

static int smack_task_setscheduler(struct task_struct *p)
{
	return smk_curacc_on_task(p, MAY_WRITE, __func__);
}

Project: linux
File: hooks.c

static int selinux_tun_dev_alloc_security(void **security)
{
	struct tun_security_struct *tunsec;

	tunsec = kzalloc(sizeof(*tunsec), GFP_KERNEL);
	if (!tunsec)
		return -ENOMEM;
	tunsec->sid = current_sid();

	*security = tunsec;
	return 0;
}

Project: linux
File: hooks.c

static void __net_exit selinux_nf_unregister(struct net *net)
{
	nf_unregister_net_hooks(net, selinux_nf_ops,
				ARRAY_SIZE(selinux_nf_ops));
}

Project: linux

static struct smack_known *smack_ipv4host_label(struct sockaddr_in *sip)
{
	struct smk_net4addr *snp;
	struct in_addr *siap = &sip->sin_addr;

	if (siap->s_addr == 0)
		return NULL;

	list_for_each_entry_rcu(snp, &smk_net4addr_list, list)
		/*
		 * we break after finding the first match because
		 * the list is sorted from longest to shortest mask
		 * so we have found the most specific match
		 */
		if (snp->smk_host.s_addr ==
		    (siap->s_addr & snp->smk_mask.s_addr))
			return snp->smk_label;

	return NULL;
}

Project: linux

static int smk_ptrace_rule_check(struct task_struct *tracer,
				 struct smack_known *tracee_known,
				 unsigned int mode, const char *func)
{
	int rc;
	struct smk_audit_info ad, *saip = NULL;
	struct task_smack *tsp;
	struct smack_known *tracer_known;
	const struct cred *tracercred;

	if ((mode & PTRACE_MODE_NOAUDIT) == 0) {
		smk_ad_init(&ad, func, LSM_AUDIT_DATA_TASK);
		smk_ad_setfield_u_tsk(&ad, tracer);
		saip = &ad;
	}

	rcu_read_lock();
	tracercred = __task_cred(tracer);
	tsp = smack_cred(tracercred);
	tracer_known = smk_of_task(tsp);

	if ((mode & PTRACE_MODE_ATTACH) &&
	    (smack_ptrace_rule == SMACK_PTRACE_EXACT ||
	     smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)) {
		if (tracer_known->smk_known == tracee_known->smk_known)
			rc = 0;
		else if (smack_ptrace_rule == SMACK_PTRACE_DRACONIAN)
			rc = -EACCES;
		else if (smack_privileged_cred(CAP_SYS_PTRACE, tracercred))
			rc = 0;
		else
			rc = -EACCES;

		if (saip)
			smack_log(tracer_known->smk_known,
				  tracee_known->smk_known,
				  0, rc, saip);

		rcu_read_unlock();
		return rc;
	}

	/* In case of rule==SMACK_PTRACE_DEFAULT or mode==PTRACE_MODE_READ */
	rc = smk_tskacc(tsp, tracee_known, smk_ptrace_mode(mode), saip);

	rcu_read_unlock();
	return rc;
}

Project: linux
File: hooks.c

static int selinux_file_alloc_security(struct file *file)
{
	struct file_security_struct *fsec = selinux_file(file);
	u32 sid = current_sid();

	fsec->sid = sid;
	fsec->fown_sid = sid;

	return 0;
}

Project: linux
File: hooks.c

static int selinux_ismaclabel(const char *name)
{
	return (strcmp(name, XATTR_SELINUX_SUFFIX) == 0);
}

Project: linux

static int smack_syslog(int typefrom_file)
{
	int rc = 0;
	struct smack_known *skp = smk_of_current();

	if (smack_privileged(CAP_MAC_OVERRIDE))
		return 0;

	if (smack_syslog_label != NULL && smack_syslog_label != skp)
		rc = -EACCES;

	return rc;
}

Project: linux

static int smk_bu_file(struct file *file, int mode, int rc)
{
	struct task_smack *tsp = smack_cred(current_cred());
	struct smack_known *sskp = tsp->smk_task;
	struct inode *inode = file_inode(file);
	struct inode_smack *isp = smack_inode(inode);
	char acc[SMK_NUM_ACCESS_TYPE + 1];

	if (isp->smk_flags & SMK_INODE_IMPURE)
		pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
			inode->i_sb->s_id, inode->i_ino, current->comm);

	if (rc <= 0)
		return rc;
	if (rc > SMACK_UNCONFINED_OBJECT)
		rc = 0;

	smk_bu_mode(mode, acc);
	pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
		sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
		inode->i_sb->s_id, inode->i_ino, file,
		current->comm);
	return 0;
}

Project: linux
File: hooks.c

static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
{
	int err;
	struct inode_security_struct *isec;
	struct inode_security_struct *newisec;
	u16 sclass;
	u32 sid;

	err = sock_has_perm(sock->sk, SOCKET__ACCEPT);
	if (err)
		return err;

	isec = inode_security_novalidate(SOCK_INODE(sock));
	spin_lock(&isec->lock);
	sclass = isec->sclass;
	sid = isec->sid;
	spin_unlock(&isec->lock);

	newisec = inode_security_novalidate(SOCK_INODE(newsock));
	newisec->sclass = sclass;
	newisec->sid = sid;
	newisec->initialized = LABEL_INITIALIZED;

	return 0;
}

Project: linux

static int smack_inode_copy_up(struct dentry *dentry, struct cred **new)
{

	struct task_smack *tsp;
	struct smack_known *skp;
	struct inode_smack *isp;
	struct cred *new_creds = *new;

	if (new_creds == NULL) {
		new_creds = prepare_creds();
		if (new_creds == NULL)
			return -ENOMEM;
	}

	tsp = smack_cred(new_creds);

	/*
	 * Get label from overlay inode and set it in create_sid
	 */
	isp = smack_inode(d_inode(dentry->d_parent));
	skp = isp->smk_inode;
	tsp->smk_task = skp;
	*new = new_creds;
	return 0;
}

Project: linux

static int selinux_sb_mnt_opts_compat(struct super_block *sb, void *mnt_opts)
{
	struct selinux_mnt_opts *opts = mnt_opts;
	struct superblock_security_struct *sbsec = sb->s_security;
	u32 sid;
	int rc;

	/*
	 * Superblock not initialized (i.e. no options) - reject if any
	 * options specified, otherwise accept.
	 */
	if (!(sbsec->flags & SE_SBINITIALIZED))
		return opts ? 1 : 0;

	/*
	 * Superblock initialized and no options specified - reject if
	 * superblock has any options set, otherwise accept.
	 */
	if (!opts)
		return (sbsec->flags & SE_MNTMASK) ? 1 : 0;

	if (opts->fscontext) {
		rc = parse_sid(sb, opts->fscontext, &sid);
		if (rc)
			return 1;
		if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
			return 1;
	}
	if (opts->context) {
		rc = parse_sid(sb, opts->context, &sid);
		if (rc)
			return 1;
		if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
			return 1;
	}
	if (opts->rootcontext) {
		struct inode_security_struct *root_isec;

		root_isec = backing_inode_security(sb->s_root);
		rc = parse_sid(sb, opts->rootcontext, &sid);
		if (rc)
			return 1;
		if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
			return 1;
	}
	if (opts->defcontext) {
		rc = parse_sid(sb, opts->defcontext, &sid);
		if (rc)
			return 1;
		if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
			return 1;
	}
	return 0;
}

Project: linux
File: hooks.c

static int selinux_move_mount(const struct path *from_path,
			      const struct path *to_path)
{
	const struct cred *cred = current_cred();

	return path_has_perm(cred, to_path, FILE__MOUNTON);
}

Project: linux

static int smack_bprm_creds_for_exec(struct linux_binprm *bprm)
{
	struct inode *inode = file_inode(bprm->file);
	struct task_smack *bsp = smack_cred(bprm->cred);
	struct inode_smack *isp;
	struct superblock_smack *sbsp;
	int rc;

	isp = smack_inode(inode);
	if (isp->smk_task == NULL || isp->smk_task == bsp->smk_task)
		return 0;

	sbsp = smack_superblock(inode->i_sb);
	if ((sbsp->smk_flags & SMK_SB_UNTRUSTED) &&
	    isp->smk_task != sbsp->smk_root)
		return 0;

	if (bprm->unsafe & LSM_UNSAFE_PTRACE) {
		struct task_struct *tracer;
		rc = 0;

		rcu_read_lock();
		tracer = ptrace_parent(current);
		if (likely(tracer != NULL))
			rc = smk_ptrace_rule_check(tracer,
						   isp->smk_task,
						   PTRACE_MODE_ATTACH,
						   __func__);
		rcu_read_unlock();

		if (rc != 0)
			return rc;
	}
	if (bprm->unsafe & ~LSM_UNSAFE_PTRACE)
		return -EPERM;

	bsp->smk_task = isp->smk_task;
	bprm->per_clear |= PER_CLEAR_ON_SETID;

	/* Decide if this is a secure exec. */
	if (bsp->smk_task != bsp->smk_forked)
		bprm->secureexec = 1;

	return 0;
}

Project: linux
File: hooks.c

static unsigned int selinux_ipv4_postroute(void *priv,
					   struct sk_buff *skb,
					   const struct nf_hook_state *state)
{
	return selinux_ip_postroute(skb, state->out, PF_INET);
}

Project: linux

static int selinux_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
{
	int len = 0;
	len = selinux_inode_getsecurity(&init_user_ns, inode,
					XATTR_SELINUX_SUFFIX, ctx, true);
	if (len < 0)
		return len;
	*ctxlen = len;
	return 0;
}

Project: linux

static int selinux_binder_transfer_binder(struct task_struct *from,
					  struct task_struct *to)
{
	return avc_has_perm(&selinux_state,
			    task_sid_binder(from), task_sid_binder(to),
			    SECCLASS_BINDER, BINDER__TRANSFER,
			    NULL);
}

Project: linux

static struct smack_known *smack_from_skb(struct sk_buff *skb)
{
	if (skb == NULL || skb->secmark == 0)
		return NULL;

	return smack_from_secid(skb->secmark);
}

Project: linux

static int smk_ipv6_port_check(struct sock *sk, struct sockaddr_in6 *address,
				int act)
{
	struct smk_port_label *spp;
	struct socket_smack *ssp = sk->sk_security;
	struct smack_known *skp = NULL;
	unsigned short port;
	struct smack_known *object;

	if (act == SMK_RECEIVING) {
		skp = smack_ipv6host_label(address);
		object = ssp->smk_in;
	} else {
		skp = ssp->smk_out;
		object = smack_ipv6host_label(address);
	}

	/*
	 * The other end is a single label host.
	 */
	if (skp != NULL && object != NULL)
		return smk_ipv6_check(skp, object, address, act);
	if (skp == NULL)
		skp = smack_net_ambient;
	if (object == NULL)
		object = smack_net_ambient;

	/*
	 * It's remote, so port lookup does no good.
	 */
	if (!smk_ipv6_localhost(address))
		return smk_ipv6_check(skp, object, address, act);

	/*
	 * It's local so the send check has to have passed.
	 */
	if (act == SMK_RECEIVING)
		return 0;

	port = ntohs(address->sin6_port);
	rcu_read_lock();
	list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
		if (spp->smk_port != port || spp->smk_sock_type != sk->sk_type)
			continue;
		object = spp->smk_in;
		if (act == SMK_CONNECTING)
			ssp->smk_packet = spp->smk_out;
		break;
	}
	rcu_read_unlock();

	return smk_ipv6_check(skp, object, address, act);
}

Project: linux
File: hooks.c

static int selinux_secctx_to_secid(const char *secdata, u32 seclen, u32 *secid)
{
	return security_context_to_sid(&selinux_state, secdata, seclen,
				       secid, GFP_KERNEL);
}

Project: linux
File: hooks.c

static int __init selinux_enabled_setup(char *str)
{
	unsigned long enabled;
	if (!kstrtoul(str, 0, &enabled))
		selinux_enabled_boot = enabled ? 1 : 0;
	return 1;
}

Project: linux
File: hooks.c

static int may_link(struct inode *dir,
		    struct dentry *dentry,
		    int kind)

{
	struct inode_security_struct *dsec, *isec;
	struct common_audit_data ad;
	u32 sid = current_sid();
	u32 av;
	int rc;

	dsec = inode_security(dir);
	isec = backing_inode_security(dentry);

	ad.type = LSM_AUDIT_DATA_DENTRY;
	ad.u.dentry = dentry;

	av = DIR__SEARCH;
	av |= (kind ? DIR__REMOVE_NAME : DIR__ADD_NAME);
	rc = avc_has_perm(&selinux_state,
			  sid, dsec->sid, SECCLASS_DIR, av, &ad);
	if (rc)
		return rc;

	switch (kind) {
	case MAY_LINK:
		av = FILE__LINK;
		break;
	case MAY_UNLINK:
		av = FILE__UNLINK;
		break;
	case MAY_RMDIR:
		av = DIR__RMDIR;
		break;
	default:
		pr_warn("SELinux: %s:  unrecognized kind %d\n",
			__func__, kind);
		return 0;
	}

	rc = avc_has_perm(&selinux_state,
			  sid, isec->sid, isec->sclass, av, &ad);
	return rc;
}

Project: linux

static int selinux_task_kill(struct task_struct *p, struct kernel_siginfo *info,
				int sig, const struct cred *cred)
{
	u32 secid;
	u32 perm;

	if (!sig)
		perm = PROCESS__SIGNULL; /* null signal; existence test */
	else
		perm = signal_to_av(sig);
	if (!cred)
		secid = current_sid();
	else
		secid = cred_sid(cred);
	return avc_has_perm(&selinux_state,
			    secid, task_sid_obj(p), SECCLASS_PROCESS, perm, NULL);
}

Project: linux
File: hooks.c

static int selinux_kernel_module_from_file(struct file *file)
{
	struct common_audit_data ad;
	struct inode_security_struct *isec;
	struct file_security_struct *fsec;
	u32 sid = current_sid();
	int rc;

	/* init_module */
	if (file == NULL)
		return avc_has_perm(&selinux_state,
				    sid, sid, SECCLASS_SYSTEM,
					SYSTEM__MODULE_LOAD, NULL);

	/* finit_module */

	ad.type = LSM_AUDIT_DATA_FILE;
	ad.u.file = file;

	fsec = selinux_file(file);
	if (sid != fsec->sid) {
		rc = avc_has_perm(&selinux_state,
				  sid, fsec->sid, SECCLASS_FD, FD__USE, &ad);
		if (rc)
			return rc;
	}

	isec = inode_security(file_inode(file));
	return avc_has_perm(&selinux_state,
			    sid, isec->sid, SECCLASS_SYSTEM,
				SYSTEM__MODULE_LOAD, &ad);
}

Project: linux

static int selinux_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
{
	return __vfs_setxattr_noperm(&init_user_ns, dentry, XATTR_NAME_SELINUX,
				     ctx, ctxlen, 0);
}

Project: linux
File: hooks.c

static inline u32 file_mask_to_av(int mode, int mask)
{
	u32 av = 0;

	if (!S_ISDIR(mode)) {
		if (mask & MAY_EXEC)
			av |= FILE__EXECUTE;
		if (mask & MAY_READ)
			av |= FILE__READ;

		if (mask & MAY_APPEND)
			av |= FILE__APPEND;
		else if (mask & MAY_WRITE)
			av |= FILE__WRITE;

	} else {
		if (mask & MAY_EXEC)
			av |= DIR__SEARCH;
		if (mask & MAY_WRITE)
			av |= DIR__WRITE;
		if (mask & MAY_READ)
			av |= DIR__READ;
	}

	return av;
}

Project: linux

static int smack_file_fcntl(struct file *file, unsigned int cmd,
			    unsigned long arg)
{
	struct smk_audit_info ad;
	int rc = 0;
	struct inode *inode = file_inode(file);

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	switch (cmd) {
	case F_GETLK:
		break;
	case F_SETLK:
	case F_SETLKW:
		smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
		smk_ad_setfield_u_fs_path(&ad, file->f_path);
		rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
		rc = smk_bu_file(file, MAY_LOCK, rc);
		break;
	case F_SETOWN:
	case F_SETSIG:
		smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
		smk_ad_setfield_u_fs_path(&ad, file->f_path);
		rc = smk_curacc(smk_of_inode(inode), MAY_WRITE, &ad);
		rc = smk_bu_file(file, MAY_WRITE, rc);
		break;
	default:
		break;
	}

	return rc;
}

Project: linux

static int smack_socket_socketpair(struct socket *socka,
		                   struct socket *sockb)
{
	struct socket_smack *asp = socka->sk->sk_security;
	struct socket_smack *bsp = sockb->sk->sk_security;

	asp->smk_packet = bsp->smk_out;
	bsp->smk_packet = asp->smk_out;

	return 0;
}

Project: linux

static int selinux_task_setpgid(struct task_struct *p, pid_t pgid)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
			    PROCESS__SETPGID, NULL);
}

Project: linux
File: hooks.c

static unsigned int selinux_ip_postroute(struct sk_buff *skb,
					 const struct net_device *outdev,
					 u16 family)
{
	u32 secmark_perm;
	u32 peer_sid;
	int ifindex = outdev->ifindex;
	struct sock *sk;
	struct common_audit_data ad;
	struct lsm_network_audit net = {0,};
	char *addrp;
	u8 secmark_active;
	u8 peerlbl_active;

	/* If any sort of compatibility mode is enabled then handoff processing
	 * to the selinux_ip_postroute_compat() function to deal with the
	 * special handling.  We do this in an attempt to keep this function
	 * as fast and as clean as possible. */
	if (!selinux_policycap_netpeer())
		return selinux_ip_postroute_compat(skb, ifindex, family);

	secmark_active = selinux_secmark_enabled();
	peerlbl_active = selinux_peerlbl_enabled();
	if (!secmark_active && !peerlbl_active)
		return NF_ACCEPT;

	sk = skb_to_full_sk(skb);

#ifdef CONFIG_XFRM
	/* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
	 * packet transformation so allow the packet to pass without any checks
	 * since we'll have another chance to perform access control checks
	 * when the packet is on it's final way out.
	 * NOTE: there appear to be some IPv6 multicast cases where skb->dst
	 *       is NULL, in this case go ahead and apply access control.
	 * NOTE: if this is a local socket (skb->sk != NULL) that is in the
	 *       TCP listening state we cannot wait until the XFRM processing
	 *       is done as we will miss out on the SA label if we do;
	 *       unfortunately, this means more work, but it is only once per
	 *       connection. */
	if (skb_dst(skb) != NULL && skb_dst(skb)->xfrm != NULL &&
	    !(sk && sk_listener(sk)))
		return NF_ACCEPT;
#endif

	if (sk == NULL) {
		/* Without an associated socket the packet is either coming
		 * from the kernel or it is being forwarded; check the packet
		 * to determine which and if the packet is being forwarded
		 * query the packet directly to determine the security label. */
		if (skb->skb_iif) {
			secmark_perm = PACKET__FORWARD_OUT;
			if (selinux_skb_peerlbl_sid(skb, family, &peer_sid))
				return NF_DROP;
		} else {
			secmark_perm = PACKET__SEND;
			peer_sid = SECINITSID_KERNEL;
		}
	} else if (sk_listener(sk)) {
		/* Locally generated packet but the associated socket is in the
		 * listening state which means this is a SYN-ACK packet.  In
		 * this particular case the correct security label is assigned
		 * to the connection/request_sock but unfortunately we can't
		 * query the request_sock as it isn't queued on the parent
		 * socket until after the SYN-ACK packet is sent; the only
		 * viable choice is to regenerate the label like we do in
		 * selinux_inet_conn_request().  See also selinux_ip_output()
		 * for similar problems. */
		u32 skb_sid;
		struct sk_security_struct *sksec;

		sksec = sk->sk_security;
		if (selinux_skb_peerlbl_sid(skb, family, &skb_sid))
			return NF_DROP;
		/* At this point, if the returned skb peerlbl is SECSID_NULL
		 * and the packet has been through at least one XFRM
		 * transformation then we must be dealing with the "final"
		 * form of labeled IPsec packet; since we've already applied
		 * all of our access controls on this packet we can safely
		 * pass the packet. */
		if (skb_sid == SECSID_NULL) {
			switch (family) {
			case PF_INET:
				if (IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
					return NF_ACCEPT;
				break;
			case PF_INET6:
				if (IP6CB(skb)->flags & IP6SKB_XFRM_TRANSFORMED)
					return NF_ACCEPT;
				break;
			default:
				return NF_DROP_ERR(-ECONNREFUSED);
			}
		}
		if (selinux_conn_sid(sksec->sid, skb_sid, &peer_sid))
			return NF_DROP;
		secmark_perm = PACKET__SEND;
	} else {
		/* Locally generated packet, fetch the security label from the
		 * associated socket. */
		struct sk_security_struct *sksec = sk->sk_security;
		peer_sid = sksec->sid;
		secmark_perm = PACKET__SEND;
	}

	ad.type = LSM_AUDIT_DATA_NET;
	ad.u.net = &net;
	ad.u.net->netif = ifindex;
	ad.u.net->family = family;
	if (selinux_parse_skb(skb, &ad, &addrp, 0, NULL))
		return NF_DROP;

	if (secmark_active)
		if (avc_has_perm(&selinux_state,
				 peer_sid, skb->secmark,
				 SECCLASS_PACKET, secmark_perm, &ad))
			return NF_DROP_ERR(-ECONNREFUSED);

	if (peerlbl_active) {
		u32 if_sid;
		u32 node_sid;

		if (sel_netif_sid(dev_net(outdev), ifindex, &if_sid))
			return NF_DROP;
		if (avc_has_perm(&selinux_state,
				 peer_sid, if_sid,
				 SECCLASS_NETIF, NETIF__EGRESS, &ad))
			return NF_DROP_ERR(-ECONNREFUSED);

		if (sel_netnode_sid(addrp, family, &node_sid))
			return NF_DROP;
		if (avc_has_perm(&selinux_state,
				 peer_sid, node_sid,
				 SECCLASS_NODE, NODE__SENDTO, &ad))
			return NF_DROP_ERR(-ECONNREFUSED);
	}

	return NF_ACCEPT;
}

Project: linux
File: hooks.c

static u32 bpf_map_fmode_to_av(fmode_t fmode)
{
	u32 av = 0;

	if (fmode & FMODE_READ)
		av |= BPF__MAP_READ;
	if (fmode & FMODE_WRITE)
		av |= BPF__MAP_WRITE;
	return av;
}

Project: linux

static int smk_bu_note(char *note, struct smack_known *sskp,
		       struct smack_known *oskp, int mode, int rc)
{
	char acc[SMK_NUM_ACCESS_TYPE + 1];

	if (rc <= 0)
		return rc;
	if (rc > SMACK_UNCONFINED_OBJECT)
		rc = 0;

	smk_bu_mode(mode, acc);
	pr_info("Smack %s: (%s %s %s) %s\n", smk_bu_mess[rc],
		sskp->smk_known, oskp->smk_known, acc, note);
	return 0;
}

Project: linux

static int smack_ipc_alloc_security(struct kern_ipc_perm *isp)
{
	struct smack_known **blob = smack_ipc(isp);

	*blob = smk_of_current();
	return 0;
}

Project: linux
File: hooks.c

static int selinux_inode_mkdir(struct inode *dir, struct dentry *dentry, umode_t mask)
{
	return may_create(dir, dentry, SECCLASS_DIR);
}

Project: linux
File: hooks.c

static int selinux_perf_event_alloc(struct perf_event *event)
{
	struct perf_event_security_struct *perfsec;

	perfsec = kzalloc(sizeof(*perfsec), GFP_KERNEL);
	if (!perfsec)
		return -ENOMEM;

	perfsec->sid = current_sid();
	event->security = perfsec;

	return 0;
}

Project: linux
File: hooks.c

static int bad_option(struct superblock_security_struct *sbsec, char flag,
		      u32 old_sid, u32 new_sid)
{
	char mnt_flags = sbsec->flags & SE_MNTMASK;

	/* check if the old mount command had the same options */
	if (sbsec->flags & SE_SBINITIALIZED)
		if (!(sbsec->flags & flag) ||
		    (old_sid != new_sid))
			return 1;

	/* check if we were passed the same options twice,
	 * aka someone passed context=a,context=b
	 */
	if (!(sbsec->flags & SE_SBINITIALIZED))
		if (mnt_flags & flag)
			return 1;
	return 0;
}

Project: linux

static int selinux_inode_init_security(struct inode *inode, struct inode *dir,
				       const struct qstr *qstr,
				       const char **name,
				       void **value, size_t *len)
{
	const struct task_security_struct *tsec = selinux_cred(current_cred());
	struct superblock_security_struct *sbsec;
	u32 newsid, clen;
	int rc;
	char *context;

	sbsec = selinux_superblock(dir->i_sb);

	newsid = tsec->create_sid;

	rc = selinux_determine_inode_label(tsec, dir, qstr,
		inode_mode_to_security_class(inode->i_mode),
		&newsid);
	if (rc)
		return rc;

	/* Possibly defer initialization to selinux_complete_init. */
	if (sbsec->flags & SE_SBINITIALIZED) {
		struct inode_security_struct *isec = selinux_inode(inode);
		isec->sclass = inode_mode_to_security_class(inode->i_mode);
		isec->sid = newsid;
		isec->initialized = LABEL_INITIALIZED;
	}

	if (!selinux_initialized(&selinux_state) ||
	    !(sbsec->flags & SBLABEL_MNT))
		return -EOPNOTSUPP;

	if (name)
		*name = XATTR_SELINUX_SUFFIX;

	if (value && len) {
		rc = security_sid_to_context_force(&selinux_state, newsid,
						   &context, &clen);
		if (rc)
			return rc;
		*value = context;
		*len = clen;
	}

	return 0;
}

Project: linux

static inline int default_protocol_stream(int protocol)
{
	return (protocol == IPPROTO_IP || protocol == IPPROTO_TCP ||
		protocol == IPPROTO_MPTCP);
}

Project: linux
File: hooks.c

static void selinux_sctp_sk_clone(struct sctp_endpoint *ep, struct sock *sk,
				  struct sock *newsk)
{
	struct sk_security_struct *sksec = sk->sk_security;
	struct sk_security_struct *newsksec = newsk->sk_security;

	/* If policy does not support SECCLASS_SCTP_SOCKET then call
	 * the non-sctp clone version.
	 */
	if (!selinux_policycap_extsockclass())
		return selinux_sk_clone_security(sk, newsk);

	newsksec->sid = ep->secid;
	newsksec->peer_sid = ep->peer_secid;
	newsksec->sclass = sksec->sclass;
	selinux_netlbl_sctp_sk_clone(sk, newsk);
}

Project: linux

static void smack_inode_getsecid(struct inode *inode, u32 *secid)
{
	struct smack_known *skp = smk_of_inode(inode);

	*secid = skp->smk_secid;
}

Project: linux
File: hooks.c

static int __init checkreqprot_setup(char *str)
{
	unsigned long checkreqprot;

	if (!kstrtoul(str, 0, &checkreqprot)) {
		selinux_checkreqprot_boot = checkreqprot ? 1 : 0;
		if (checkreqprot)
			pr_warn("SELinux: checkreqprot set to 1 via kernel parameter.  This is deprecated and will be rejected in a future kernel release.\n");
	}
	return 1;
}

Project: linux

static int smack_inode_rename(struct inode *old_inode,
			      struct dentry *old_dentry,
			      struct inode *new_inode,
			      struct dentry *new_dentry)
{
	int rc;
	struct smack_known *isp;
	struct smk_audit_info ad;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
	smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);

	isp = smk_of_inode(d_backing_inode(old_dentry));
	rc = smk_curacc(isp, MAY_READWRITE, &ad);
	rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_READWRITE, rc);

	if (rc == 0 && d_is_positive(new_dentry)) {
		isp = smk_of_inode(d_backing_inode(new_dentry));
		smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
		rc = smk_curacc(isp, MAY_READWRITE, &ad);
		rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_READWRITE, rc);
	}
	return rc;
}

Project: linux

static int selinux_binder_transfer_file(struct task_struct *from,
					struct task_struct *to,
					struct file *file)
{
	u32 sid = task_sid_binder(to);
	struct file_security_struct *fsec = selinux_file(file);
	struct dentry *dentry = file->f_path.dentry;
	struct inode_security_struct *isec;
	struct common_audit_data ad;
	int rc;

	ad.type = LSM_AUDIT_DATA_PATH;
	ad.u.path = file->f_path;

	if (sid != fsec->sid) {
		rc = avc_has_perm(&selinux_state,
				  sid, fsec->sid,
				  SECCLASS_FD,
				  FD__USE,
				  &ad);
		if (rc)
			return rc;
	}

#ifdef CONFIG_BPF_SYSCALL
	rc = bpf_fd_pass(file, sid);
	if (rc)
		return rc;
#endif

	if (unlikely(IS_PRIVATE(d_backing_inode(dentry))))
		return 0;

	isec = backing_inode_security(dentry);
	return avc_has_perm(&selinux_state,
			    sid, isec->sid, isec->sclass, file_to_av(file),
			    &ad);
}

Project: linux
File: hooks.c

static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
{
	u32 peer_secid = SECSID_NULL;
	u16 family;
	struct inode_security_struct *isec;

	if (skb && skb->protocol == htons(ETH_P_IP))
		family = PF_INET;
	else if (skb && skb->protocol == htons(ETH_P_IPV6))
		family = PF_INET6;
	else if (sock)
		family = sock->sk->sk_family;
	else
		goto out;

	if (sock && family == PF_UNIX) {
		isec = inode_security_novalidate(SOCK_INODE(sock));
		peer_secid = isec->sid;
	} else if (skb)
		selinux_skb_peerlbl_sid(skb, family, &peer_secid);

out:
	*secid = peer_secid;
	if (peer_secid == SECSID_NULL)
		return -EINVAL;
	return 0;
}

Project: linux

static int selinux_capget(struct task_struct *target, kernel_cap_t *effective,
			  kernel_cap_t *inheritable, kernel_cap_t *permitted)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_obj(target), SECCLASS_PROCESS,
			    PROCESS__GETCAP, NULL);
}

Project: linux
File: hooks.c

static void selinux_release_secctx(char *secdata, u32 seclen)
{
	kfree(secdata);
}

Project: linux

static int superblock_has_perm(const struct cred *cred,
			       struct super_block *sb,
			       u32 perms,
			       struct common_audit_data *ad)
{
	struct superblock_security_struct *sbsec;
	u32 sid = cred_sid(cred);

	sbsec = selinux_superblock(sb);
	return avc_has_perm(&selinux_state,
			    sid, sbsec->sid, SECCLASS_FILESYSTEM, perms, ad);
}

Project: linux
File: hooks.c

static int selinux_socket_setsockopt(struct socket *sock, int level, int optname)
{
	int err;

	err = sock_has_perm(sock->sk, SOCKET__SETOPT);
	if (err)
		return err;

	return selinux_netlbl_socket_setsockopt(sock, level, optname);
}

Project: linux

static void smack_inet_csk_clone(struct sock *sk,
				 const struct request_sock *req)
{
	struct socket_smack *ssp = sk->sk_security;
	struct smack_known *skp;

	if (req->peer_secid != 0) {
		skp = smack_from_secid(req->peer_secid);
		ssp->smk_packet = skp;
	} else
		ssp->smk_packet = NULL;
}

Project: linux

static int selinux_set_mnt_opts(struct super_block *sb,
				void *mnt_opts,
				unsigned long kern_flags,
				unsigned long *set_kern_flags)
{
	const struct cred *cred = current_cred();
	struct superblock_security_struct *sbsec = selinux_superblock(sb);
	struct dentry *root = sb->s_root;
	struct selinux_mnt_opts *opts = mnt_opts;
	struct inode_security_struct *root_isec;
	u32 fscontext_sid = 0, context_sid = 0, rootcontext_sid = 0;
	u32 defcontext_sid = 0;
	int rc = 0;

	mutex_lock(&sbsec->lock);

	if (!selinux_initialized(&selinux_state)) {
		if (!opts) {
			/* Defer initialization until selinux_complete_init,
			   after the initial policy is loaded and the security
			   server is ready to handle calls. */
			goto out;
		}
		rc = -EINVAL;
		pr_warn("SELinux: Unable to set superblock options "
			"before the security server is initialized\n");
		goto out;
	}
	if (kern_flags && !set_kern_flags) {
		/* Specifying internal flags without providing a place to
		 * place the results is not allowed */
		rc = -EINVAL;
		goto out;
	}

	/*
	 * Binary mount data FS will come through this function twice.  Once
	 * from an explicit call and once from the generic calls from the vfs.
	 * Since the generic VFS calls will not contain any security mount data
	 * we need to skip the double mount verification.
	 *
	 * This does open a hole in which we will not notice if the first
	 * mount using this sb set explict options and a second mount using
	 * this sb does not set any security options.  (The first options
	 * will be used for both mounts)
	 */
	if ((sbsec->flags & SE_SBINITIALIZED) && (sb->s_type->fs_flags & FS_BINARY_MOUNTDATA)
	    && !opts)
		goto out;

	root_isec = backing_inode_security_novalidate(root);

	/*
	 * parse the mount options, check if they are valid sids.
	 * also check if someone is trying to mount the same sb more
	 * than once with different security options.
	 */
	if (opts) {
		if (opts->fscontext) {
			rc = parse_sid(sb, opts->fscontext, &fscontext_sid);
			if (rc)
				goto out;
			if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid,
					fscontext_sid))
				goto out_double_mount;
			sbsec->flags |= FSCONTEXT_MNT;
		}
		if (opts->context) {
			rc = parse_sid(sb, opts->context, &context_sid);
			if (rc)
				goto out;
			if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid,
					context_sid))
				goto out_double_mount;
			sbsec->flags |= CONTEXT_MNT;
		}
		if (opts->rootcontext) {
			rc = parse_sid(sb, opts->rootcontext, &rootcontext_sid);
			if (rc)
				goto out;
			if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid,
					rootcontext_sid))
				goto out_double_mount;
			sbsec->flags |= ROOTCONTEXT_MNT;
		}
		if (opts->defcontext) {
			rc = parse_sid(sb, opts->defcontext, &defcontext_sid);
			if (rc)
				goto out;
			if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid,
					defcontext_sid))
				goto out_double_mount;
			sbsec->flags |= DEFCONTEXT_MNT;
		}
	}

	if (sbsec->flags & SE_SBINITIALIZED) {
		/* previously mounted with options, but not on this attempt? */
		if ((sbsec->flags & SE_MNTMASK) && !opts)
			goto out_double_mount;
		rc = 0;
		goto out;
	}

	if (strcmp(sb->s_type->name, "proc") == 0)
		sbsec->flags |= SE_SBPROC | SE_SBGENFS;

	if (!strcmp(sb->s_type->name, "debugfs") ||
	    !strcmp(sb->s_type->name, "tracefs") ||
	    !strcmp(sb->s_type->name, "binder") ||
	    !strcmp(sb->s_type->name, "bpf") ||
	    !strcmp(sb->s_type->name, "pstore"))
		sbsec->flags |= SE_SBGENFS;

	if (!strcmp(sb->s_type->name, "sysfs") ||
	    !strcmp(sb->s_type->name, "cgroup") ||
	    !strcmp(sb->s_type->name, "cgroup2"))
		sbsec->flags |= SE_SBGENFS | SE_SBGENFS_XATTR;

	if (!sbsec->behavior) {
		/*
		 * Determine the labeling behavior to use for this
		 * filesystem type.
		 */
		rc = security_fs_use(&selinux_state, sb);
		if (rc) {
			pr_warn("%s: security_fs_use(%s) returned %d\n",
					__func__, sb->s_type->name, rc);
			goto out;
		}
	}

	/*
	 * If this is a user namespace mount and the filesystem type is not
	 * explicitly whitelisted, then no contexts are allowed on the command
	 * line and security labels must be ignored.
	 */
	if (sb->s_user_ns != &init_user_ns &&
	    strcmp(sb->s_type->name, "tmpfs") &&
	    strcmp(sb->s_type->name, "ramfs") &&
	    strcmp(sb->s_type->name, "devpts") &&
	    strcmp(sb->s_type->name, "overlay")) {
		if (context_sid || fscontext_sid || rootcontext_sid ||
		    defcontext_sid) {
			rc = -EACCES;
			goto out;
		}
		if (sbsec->behavior == SECURITY_FS_USE_XATTR) {
			sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
			rc = security_transition_sid(&selinux_state,
						     current_sid(),
						     current_sid(),
						     SECCLASS_FILE, NULL,
						     &sbsec->mntpoint_sid);
			if (rc)
				goto out;
		}
		goto out_set_opts;
	}

	/* sets the context of the superblock for the fs being mounted. */
	if (fscontext_sid) {
		rc = may_context_mount_sb_relabel(fscontext_sid, sbsec, cred);
		if (rc)
			goto out;

		sbsec->sid = fscontext_sid;
	}

	/*
	 * Switch to using mount point labeling behavior.
	 * sets the label used on all file below the mountpoint, and will set
	 * the superblock context if not already set.
	 */
	if (kern_flags & SECURITY_LSM_NATIVE_LABELS && !context_sid) {
		sbsec->behavior = SECURITY_FS_USE_NATIVE;
		*set_kern_flags |= SECURITY_LSM_NATIVE_LABELS;
	}

	if (context_sid) {
		if (!fscontext_sid) {
			rc = may_context_mount_sb_relabel(context_sid, sbsec,
							  cred);
			if (rc)
				goto out;
			sbsec->sid = context_sid;
		} else {
			rc = may_context_mount_inode_relabel(context_sid, sbsec,
							     cred);
			if (rc)
				goto out;
		}
		if (!rootcontext_sid)
			rootcontext_sid = context_sid;

		sbsec->mntpoint_sid = context_sid;
		sbsec->behavior = SECURITY_FS_USE_MNTPOINT;
	}

	if (rootcontext_sid) {
		rc = may_context_mount_inode_relabel(rootcontext_sid, sbsec,
						     cred);
		if (rc)
			goto out;

		root_isec->sid = rootcontext_sid;
		root_isec->initialized = LABEL_INITIALIZED;
	}

	if (defcontext_sid) {
		if (sbsec->behavior != SECURITY_FS_USE_XATTR &&
			sbsec->behavior != SECURITY_FS_USE_NATIVE) {
			rc = -EINVAL;
			pr_warn("SELinux: defcontext option is "
			       "invalid for this filesystem type\n");
			goto out;
		}

		if (defcontext_sid != sbsec->def_sid) {
			rc = may_context_mount_inode_relabel(defcontext_sid,
							     sbsec, cred);
			if (rc)
				goto out;
		}

		sbsec->def_sid = defcontext_sid;
	}

out_set_opts:
	rc = sb_finish_set_opts(sb);
out:
	mutex_unlock(&sbsec->lock);
	return rc;
out_double_mount:
	rc = -EINVAL;
	pr_warn("SELinux: mount invalid.  Same superblock, different "
	       "security settings for (dev %s, type %s)\n", sb->s_id,
	       sb->s_type->name);
	goto out;
}

Project: linux

static int selinux_kernel_read_file(struct file *file,
				    enum kernel_read_file_id id,
				    bool contents)
{
	int rc = 0;

	switch (id) {
	case READING_MODULE:
		rc = selinux_kernel_module_from_file(contents ? file : NULL);
		break;
	default:
		break;
	}

	return rc;
}

Project: linux
File: hooks.c

static int selinux_inode_alloc_security(struct inode *inode)
{
	struct inode_security_struct *isec = selinux_inode(inode);
	u32 sid = current_sid();

	spin_lock_init(&isec->lock);
	INIT_LIST_HEAD(&isec->list);
	isec->inode = inode;
	isec->sid = SECINITSID_UNLABELED;
	isec->sclass = SECCLASS_FILE;
	isec->task_sid = sid;
	isec->initialized = LABEL_INVALID;

	return 0;
}

Project: linux
File: hooks.c

static int selinux_msg_queue_alloc_security(struct kern_ipc_perm *msq)
{
	struct ipc_security_struct *isec;
	struct common_audit_data ad;
	u32 sid = current_sid();
	int rc;

	isec = selinux_ipc(msq);
	ipc_init_security(isec, SECCLASS_MSGQ);

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = msq->key;

	rc = avc_has_perm(&selinux_state,
			  sid, isec->sid, SECCLASS_MSGQ,
			  MSGQ__CREATE, &ad);
	return rc;
}

Project: linux
File: hooks.c

static struct inode_security_struct *backing_inode_security_novalidate(struct dentry *dentry)
{
	struct inode *inode = d_backing_inode(dentry);

	return selinux_inode(inode);
}

Project: linux
File: hooks.c

static int selinux_shm_shmat(struct kern_ipc_perm *shp,
			     char __user *shmaddr, int shmflg)
{
	u32 perms;

	if (shmflg & SHM_RDONLY)
		perms = SHM__READ;
	else
		perms = SHM__READ | SHM__WRITE;

	return ipc_has_perm(shp, perms);
}

Project: linux
File: hooks.c

static int selinux_vm_enough_memory(struct mm_struct *mm, long pages)
{
	int rc, cap_sys_admin = 0;

	rc = cred_has_capability(current_cred(), CAP_SYS_ADMIN,
				 CAP_OPT_NOAUDIT, true);
	if (rc == 0)
		cap_sys_admin = 1;

	return cap_sys_admin;
}

Project: linux
File: hooks.c

static int selinux_skb_peerlbl_sid(struct sk_buff *skb, u16 family, u32 *sid)
{
	int err;
	u32 xfrm_sid;
	u32 nlbl_sid;
	u32 nlbl_type;

	err = selinux_xfrm_skb_sid(skb, &xfrm_sid);
	if (unlikely(err))
		return -EACCES;
	err = selinux_netlbl_skbuff_getsid(skb, family, &nlbl_type, &nlbl_sid);
	if (unlikely(err))
		return -EACCES;

	err = security_net_peersid_resolve(&selinux_state, nlbl_sid,
					   nlbl_type, xfrm_sid, sid);
	if (unlikely(err)) {
		pr_warn(
		       "SELinux: failure in selinux_skb_peerlbl_sid(),"
		       " unable to determine packet's peer label\n");
		return -EACCES;
	}

	return 0;
}

Project: linux
File: hooks.c

static struct inode_security_struct *inode_security_novalidate(struct inode *inode)
{
	return selinux_inode(inode);
}

Project: linux

static int selinux_sb_remount(struct super_block *sb, void *mnt_opts)
{
	struct selinux_mnt_opts *opts = mnt_opts;
	struct superblock_security_struct *sbsec = selinux_superblock(sb);
	u32 sid;
	int rc;

	if (!(sbsec->flags & SE_SBINITIALIZED))
		return 0;

	if (!opts)
		return 0;

	if (opts->fscontext) {
		rc = parse_sid(sb, opts->fscontext, &sid);
		if (rc)
			return rc;
		if (bad_option(sbsec, FSCONTEXT_MNT, sbsec->sid, sid))
			goto out_bad_option;
	}
	if (opts->context) {
		rc = parse_sid(sb, opts->context, &sid);
		if (rc)
			return rc;
		if (bad_option(sbsec, CONTEXT_MNT, sbsec->mntpoint_sid, sid))
			goto out_bad_option;
	}
	if (opts->rootcontext) {
		struct inode_security_struct *root_isec;
		root_isec = backing_inode_security(sb->s_root);
		rc = parse_sid(sb, opts->rootcontext, &sid);
		if (rc)
			return rc;
		if (bad_option(sbsec, ROOTCONTEXT_MNT, root_isec->sid, sid))
			goto out_bad_option;
	}
	if (opts->defcontext) {
		rc = parse_sid(sb, opts->defcontext, &sid);
		if (rc)
			return rc;
		if (bad_option(sbsec, DEFCONTEXT_MNT, sbsec->def_sid, sid))
			goto out_bad_option;
	}
	return 0;

out_bad_option:
	pr_warn("SELinux: unable to change security options "
	       "during remount (dev %s, type=%s)\n", sb->s_id,
	       sb->s_type->name);
	return -EINVAL;
}

Project: linux

static void smack_sk_free_security(struct sock *sk)
{
#ifdef SMACK_IPV6_PORT_LABELING
	struct smk_port_label *spp;

	if (sk->sk_family == PF_INET6) {
		rcu_read_lock();
		list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
			if (spp->smk_sock != sk)
				continue;
			spp->smk_can_reuse = 1;
			break;
		}
		rcu_read_unlock();
	}
#endif
	kfree(sk->sk_security);
}

Project: linux

static int smk_copy_relabel(struct list_head *nhead, struct list_head *ohead,
				gfp_t gfp)
{
	struct smack_known_list_elem *nklep;
	struct smack_known_list_elem *oklep;

	list_for_each_entry(oklep, ohead, list) {
		nklep = kzalloc(sizeof(struct smack_known_list_elem), gfp);
		if (nklep == NULL) {
			smk_destroy_label_list(nhead);
			return -ENOMEM;
		}
		nklep->smk_label = oklep->smk_label;
		list_add(&nklep->list, nhead);
	}

	return 0;
}

Project: linux
File: hooks.c

static int selinux_capset(struct cred *new, const struct cred *old,
			  const kernel_cap_t *effective,
			  const kernel_cap_t *inheritable,
			  const kernel_cap_t *permitted)
{
	return avc_has_perm(&selinux_state,
			    cred_sid(old), cred_sid(new), SECCLASS_PROCESS,
			    PROCESS__SETCAP, NULL);
}

Project: linux

static int smack_getprocattr(struct task_struct *p, char *name, char **value)
{
	struct smack_known *skp = smk_of_task_struct_obj(p);
	char *cp;
	int slen;

	if (strcmp(name, "current") != 0)
		return -EINVAL;

	cp = kstrdup(skp->smk_known, GFP_KERNEL);
	if (cp == NULL)
		return -ENOMEM;

	slen = strlen(cp);
	*value = cp;
	return slen;
}

Project: linux
File: hooks.c

static int match_opt_prefix(char *s, int l, char **arg)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(tokens); i++) {
		size_t len = tokens[i].len;
		if (len > l || memcmp(s, tokens[i].name, len))
			continue;
		if (tokens[i].has_arg) {
			if (len == l || s[len] != '=')
				continue;
			*arg = s + len + 1;
		} else if (len != l)
			continue;
		return tokens[i].opt;
	}
	return Opt_error;
}

Project: linux

static int smack_cred_prepare(struct cred *new, const struct cred *old,
			      gfp_t gfp)
{
	struct task_smack *old_tsp = smack_cred(old);
	struct task_smack *new_tsp = smack_cred(new);
	int rc;

	init_task_smack(new_tsp, old_tsp->smk_task, old_tsp->smk_task);

	rc = smk_copy_rules(&new_tsp->smk_rules, &old_tsp->smk_rules, gfp);
	if (rc != 0)
		return rc;

	rc = smk_copy_relabel(&new_tsp->smk_relabel, &old_tsp->smk_relabel,
				gfp);
	return rc;
}

Project: linux

static void smack_cred_transfer(struct cred *new, const struct cred *old)
{
	struct task_smack *old_tsp = smack_cred(old);
	struct task_smack *new_tsp = smack_cred(new);

	new_tsp->smk_task = old_tsp->smk_task;
	new_tsp->smk_forked = old_tsp->smk_task;
	mutex_init(&new_tsp->smk_rules_lock);
	INIT_LIST_HEAD(&new_tsp->smk_rules);

	/* cbs copy rule list */
}

Project: linux
File: hooks.c

static int selinux_file_permission(struct file *file, int mask)
{
	struct inode *inode = file_inode(file);
	struct file_security_struct *fsec = selinux_file(file);
	struct inode_security_struct *isec;
	u32 sid = current_sid();

	if (!mask)
		/* No permission to check.  Existence test. */
		return 0;

	isec = inode_security(inode);
	if (sid == fsec->sid && fsec->isid == isec->sid &&
	    fsec->pseqno == avc_policy_seqno(&selinux_state))
		/* No change since file_open check. */
		return 0;

	return selinux_revalidate_file_permission(file, mask);
}

Project: linux

static void smk_ipv6_port_label(struct socket *sock, struct sockaddr *address)
{
	struct sock *sk = sock->sk;
	struct sockaddr_in6 *addr6;
	struct socket_smack *ssp = sock->sk->sk_security;
	struct smk_port_label *spp;
	unsigned short port = 0;

	if (address == NULL) {
		/*
		 * This operation is changing the Smack information
		 * on the bound socket. Take the changes to the port
		 * as well.
		 */
		rcu_read_lock();
		list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
			if (sk != spp->smk_sock)
				continue;
			spp->smk_in = ssp->smk_in;
			spp->smk_out = ssp->smk_out;
			rcu_read_unlock();
			return;
		}
		/*
		 * A NULL address is only used for updating existing
		 * bound entries. If there isn't one, it's OK.
		 */
		rcu_read_unlock();
		return;
	}

	addr6 = (struct sockaddr_in6 *)address;
	port = ntohs(addr6->sin6_port);
	/*
	 * This is a special case that is safely ignored.
	 */
	if (port == 0)
		return;

	/*
	 * Look for an existing port list entry.
	 * This is an indication that a port is getting reused.
	 */
	rcu_read_lock();
	list_for_each_entry_rcu(spp, &smk_ipv6_port_list, list) {
		if (spp->smk_port != port || spp->smk_sock_type != sock->type)
			continue;
		if (spp->smk_can_reuse != 1) {
			rcu_read_unlock();
			return;
		}
		spp->smk_port = port;
		spp->smk_sock = sk;
		spp->smk_in = ssp->smk_in;
		spp->smk_out = ssp->smk_out;
		spp->smk_can_reuse = 0;
		rcu_read_unlock();
		return;
	}
	rcu_read_unlock();
	/*
	 * A new port entry is required.
	 */
	spp = kzalloc(sizeof(*spp), GFP_KERNEL);
	if (spp == NULL)
		return;

	spp->smk_port = port;
	spp->smk_sock = sk;
	spp->smk_in = ssp->smk_in;
	spp->smk_out = ssp->smk_out;
	spp->smk_sock_type = sock->type;
	spp->smk_can_reuse = 0;

	mutex_lock(&smack_ipv6_lock);
	list_add_rcu(&spp->list, &smk_ipv6_port_list);
	mutex_unlock(&smack_ipv6_lock);
	return;
}

Project: linux

static int smack_post_notification(const struct cred *w_cred,
				   const struct cred *cred,
				   struct watch_notification *n)
{
	struct smk_audit_info ad;
	struct smack_known *subj, *obj;
	int rc;

	/* Always let maintenance notifications through. */
	if (n->type == WATCH_TYPE_META)
		return 0;

	if (!cred)
		return 0;
	subj = smk_of_task(smack_cred(cred));
	obj = smk_of_task(smack_cred(w_cred));

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_NOTIFICATION);
	rc = smk_access(subj, obj, MAY_WRITE, &ad);
	rc = smk_bu_note("notification", subj, obj, MAY_WRITE, rc);
	return rc;
}

Project: linux

static int smk_bu_current(char *note, struct smack_known *oskp,
			  int mode, int rc)
{
	struct task_smack *tsp = smack_cred(current_cred());
	char acc[SMK_NUM_ACCESS_TYPE + 1];

	if (rc <= 0)
		return rc;
	if (rc > SMACK_UNCONFINED_OBJECT)
		rc = 0;

	smk_bu_mode(mode, acc);
	pr_info("Smack %s: (%s %s %s) %s %s\n", smk_bu_mess[rc],
		tsp->smk_task->smk_known, oskp->smk_known,
		acc, current->comm, note);
	return 0;
}

Project: linux

static int smack_file_send_sigiotask(struct task_struct *tsk,
				     struct fown_struct *fown, int signum)
{
	struct smack_known **blob;
	struct smack_known *skp;
	struct smack_known *tkp = smk_of_task(smack_cred(tsk->cred));
	const struct cred *tcred;
	struct file *file;
	int rc;
	struct smk_audit_info ad;

	/*
	 * struct fown_struct is never outside the context of a struct file
	 */
	file = container_of(fown, struct file, f_owner);

	/* we don't log here as rc can be overriden */
	blob = smack_file(file);
	skp = *blob;
	rc = smk_access(skp, tkp, MAY_DELIVER, NULL);
	rc = smk_bu_note("sigiotask", skp, tkp, MAY_DELIVER, rc);

	rcu_read_lock();
	tcred = __task_cred(tsk);
	if (rc != 0 && smack_privileged_cred(CAP_MAC_OVERRIDE, tcred))
		rc = 0;
	rcu_read_unlock();

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_TASK);
	smk_ad_setfield_u_tsk(&ad, tsk);
	smack_log(skp->smk_known, tkp->smk_known, MAY_DELIVER, rc, &ad);
	return rc;
}

Project: linux

static int cred_has_capability(const struct cred *cred,
			       int cap, unsigned int opts, bool initns)
{
	struct common_audit_data ad;
	struct av_decision avd;
	u16 sclass;
	u32 sid = cred_sid(cred);
	u32 av = CAP_TO_MASK(cap);
	int rc;

	ad.type = LSM_AUDIT_DATA_CAP;
	ad.u.cap = cap;

	switch (CAP_TO_INDEX(cap)) {
	case 0:
		sclass = initns ? SECCLASS_CAPABILITY : SECCLASS_CAP_USERNS;
		break;
	case 1:
		sclass = initns ? SECCLASS_CAPABILITY2 : SECCLASS_CAP2_USERNS;
		break;
	default:
		pr_err("SELinux:  out of range capability %d\n", cap);
		BUG();
		return -EINVAL;
	}

	rc = avc_has_perm_noaudit(&selinux_state,
				  sid, sid, sclass, av, 0, &avd);
	if (!(opts & CAP_OPT_NOAUDIT)) {
		int rc2 = avc_audit(&selinux_state,
				    sid, sid, sclass, av, &avd, rc, &ad);
		if (rc2)
			return rc2;
	}
	return rc;
}

Project: linux
File: hooks.c

static void selinux_cred_getsecid(const struct cred *c, u32 *secid)
{
	*secid = cred_sid(c);
}

Project: linux

static int smack_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
{
	struct socket_smack *ssp = sk->sk_security;
	struct smack_known *skp = NULL;
	int rc = 0;
	struct smk_audit_info ad;
	u16 family = sk->sk_family;
#ifdef CONFIG_AUDIT
	struct lsm_network_audit net;
#endif
#if IS_ENABLED(CONFIG_IPV6)
	struct sockaddr_in6 sadd;
	int proto;

	if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
		family = PF_INET;
#endif /* CONFIG_IPV6 */

	switch (family) {
	case PF_INET:
		/*
		 * If there is a secmark use it rather than the CIPSO label.
		 * If there is no secmark fall back to CIPSO.
		 * The secmark is assumed to reflect policy better.
		 */
		skp = smack_from_skb(skb);
		if (skp == NULL) {
			skp = smack_from_netlbl(sk, family, skb);
			if (skp == NULL)
				skp = smack_net_ambient;
		}

#ifdef CONFIG_AUDIT
		smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
		ad.a.u.net->family = family;
		ad.a.u.net->netif = skb->skb_iif;
		ipv4_skb_to_auditdata(skb, &ad.a, NULL);
#endif
		/*
		 * Receiving a packet requires that the other end
		 * be able to write here. Read access is not required.
		 * This is the simplist possible security model
		 * for networking.
		 */
		rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
		rc = smk_bu_note("IPv4 delivery", skp, ssp->smk_in,
					MAY_WRITE, rc);
		if (rc != 0)
			netlbl_skbuff_err(skb, family, rc, 0);
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case PF_INET6:
		proto = smk_skb_to_addr_ipv6(skb, &sadd);
		if (proto != IPPROTO_UDP && proto != IPPROTO_UDPLITE &&
		    proto != IPPROTO_TCP && proto != IPPROTO_DCCP)
			break;
#ifdef SMACK_IPV6_SECMARK_LABELING
		skp = smack_from_skb(skb);
		if (skp == NULL) {
			if (smk_ipv6_localhost(&sadd))
				break;
			skp = smack_ipv6host_label(&sadd);
			if (skp == NULL)
				skp = smack_net_ambient;
		}
#ifdef CONFIG_AUDIT
		smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
		ad.a.u.net->family = family;
		ad.a.u.net->netif = skb->skb_iif;
		ipv6_skb_to_auditdata(skb, &ad.a, NULL);
#endif /* CONFIG_AUDIT */
		rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
		rc = smk_bu_note("IPv6 delivery", skp, ssp->smk_in,
					MAY_WRITE, rc);
#endif /* SMACK_IPV6_SECMARK_LABELING */
#ifdef SMACK_IPV6_PORT_LABELING
		rc = smk_ipv6_port_check(sk, &sadd, SMK_RECEIVING);
#endif /* SMACK_IPV6_PORT_LABELING */
		if (rc != 0)
			icmpv6_send(skb, ICMPV6_DEST_UNREACH,
					ICMPV6_ADM_PROHIBITED, 0);
		break;
#endif /* CONFIG_IPV6 */
	}

	return rc;
}

Project: linux

static void smack_task_getsecid_subj(struct task_struct *p, u32 *secid)
{
	struct smack_known *skp = smk_of_task_struct_subj(p);

	*secid = skp->smk_secid;
}

Project: linux
File: hooks.c

static int selinux_parse_skb(struct sk_buff *skb, struct common_audit_data *ad,
			     char **_addrp, int src, u8 *proto)
{
	char *addrp;
	int ret;

	switch (ad->u.net->family) {
	case PF_INET:
		ret = selinux_parse_skb_ipv4(skb, ad, proto);
		if (ret)
			goto parse_error;
		addrp = (char *)(src ? &ad->u.net->v4info.saddr :
				       &ad->u.net->v4info.daddr);
		goto okay;

#if IS_ENABLED(CONFIG_IPV6)
	case PF_INET6:
		ret = selinux_parse_skb_ipv6(skb, ad, proto);
		if (ret)
			goto parse_error;
		addrp = (char *)(src ? &ad->u.net->v6info.saddr :
				       &ad->u.net->v6info.daddr);
		goto okay;
#endif	/* IPV6 */
	default:
		addrp = NULL;
		goto okay;
	}

parse_error:
	pr_warn(
	       "SELinux: failure in selinux_parse_skb(),"
	       " unable to parse packet\n");
	return ret;

okay:
	if (_addrp)
		*_addrp = addrp;
	return 0;
}

Project: linux
File: hooks.c

static int show_sid(struct seq_file *m, u32 sid)
{
	char *context = NULL;
	u32 len;
	int rc;

	rc = security_sid_to_context(&selinux_state, sid,
					     &context, &len);
	if (!rc) {
		bool has_comma = context && strchr(context, ',');

		seq_putc(m, '=');
		if (has_comma)
			seq_putc(m, '\"');
		seq_escape(m, context, "\"\n\\");
		if (has_comma)
			seq_putc(m, '\"');
	}
	kfree(context);
	return rc;
}

Project: linux

static int smack_inode_unlink(struct inode *dir, struct dentry *dentry)
{
	struct inode *ip = d_backing_inode(dentry);
	struct smk_audit_info ad;
	int rc;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
	smk_ad_setfield_u_fs_path_dentry(&ad, dentry);

	/*
	 * You need write access to the thing you're unlinking
	 */
	rc = smk_curacc(smk_of_inode(ip), MAY_WRITE, &ad);
	rc = smk_bu_inode(ip, MAY_WRITE, rc);
	if (rc == 0) {
		/*
		 * You also need write access to the containing directory
		 */
		smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_INODE);
		smk_ad_setfield_u_fs_inode(&ad, dir);
		rc = smk_curacc(smk_of_inode(dir), MAY_WRITE, &ad);
		rc = smk_bu_inode(dir, MAY_WRITE, rc);
	}
	return rc;
}

Project: linux

static int sb_check_xattr_support(struct super_block *sb)
{
	struct superblock_security_struct *sbsec = sb->s_security;
	struct dentry *root = sb->s_root;
	struct inode *root_inode = d_backing_inode(root);
	u32 sid;
	int rc;

	/*
	 * Make sure that the xattr handler exists and that no
	 * error other than -ENODATA is returned by getxattr on
	 * the root directory.  -ENODATA is ok, as this may be
	 * the first boot of the SELinux kernel before we have
	 * assigned xattr values to the filesystem.
	 */
	if (!(root_inode->i_opflags & IOP_XATTR)) {
		pr_warn("SELinux: (dev %s, type %s) has no xattr support\n",
			sb->s_id, sb->s_type->name);
		goto fallback;
	}

	rc = __vfs_getxattr(root, root_inode, XATTR_NAME_SELINUX, NULL, 0);
	if (rc < 0 && rc != -ENODATA) {
		if (rc == -EOPNOTSUPP) {
			pr_warn("SELinux: (dev %s, type %s) has no security xattr handler\n",
				sb->s_id, sb->s_type->name);
			goto fallback;
		} else {
			pr_warn("SELinux: (dev %s, type %s) getxattr errno %d\n",
				sb->s_id, sb->s_type->name, -rc);
			return rc;
		}
	}
	return 0;

fallback:
	/* No xattr support - try to fallback to genfs if possible. */
	rc = security_genfs_sid(&selinux_state, sb->s_type->name, "/",
				SECCLASS_DIR, &sid);
	if (rc)
		return -EOPNOTSUPP;

	pr_warn("SELinux: (dev %s, type %s) falling back to genfs\n",
		sb->s_id, sb->s_type->name);
	sbsec->behavior = SECURITY_FS_USE_GENFS;
	sbsec->sid = sid;
	return 0;
}

Project: linux

static int smack_kernel_create_files_as(struct cred *new,
					struct inode *inode)
{
	struct inode_smack *isp = smack_inode(inode);
	struct task_smack *tsp = smack_cred(new);

	tsp->smk_forked = isp->smk_inode;
	tsp->smk_task = tsp->smk_forked;
	return 0;
}

Project: linux

static int smack_key_permission(key_ref_t key_ref,
				const struct cred *cred,
				enum key_need_perm need_perm)
{
	struct key *keyp;
	struct smk_audit_info ad;
	struct smack_known *tkp = smk_of_task(smack_cred(cred));
	int request = 0;
	int rc;

	/*
	 * Validate requested permissions
	 */
	switch (need_perm) {
	case KEY_NEED_READ:
	case KEY_NEED_SEARCH:
	case KEY_NEED_VIEW:
		request |= MAY_READ;
		break;
	case KEY_NEED_WRITE:
	case KEY_NEED_LINK:
	case KEY_NEED_SETATTR:
		request |= MAY_WRITE;
		break;
	case KEY_NEED_UNSPECIFIED:
	case KEY_NEED_UNLINK:
	case KEY_SYSADMIN_OVERRIDE:
	case KEY_AUTHTOKEN_OVERRIDE:
	case KEY_DEFER_PERM_CHECK:
		return 0;
	default:
		return -EINVAL;
	}

	keyp = key_ref_to_ptr(key_ref);
	if (keyp == NULL)
		return -EINVAL;
	/*
	 * If the key hasn't been initialized give it access so that
	 * it may do so.
	 */
	if (keyp->security == NULL)
		return 0;
	/*
	 * This should not occur
	 */
	if (tkp == NULL)
		return -EACCES;

	if (smack_privileged(CAP_MAC_OVERRIDE))
		return 0;

#ifdef CONFIG_AUDIT
	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
	ad.a.u.key_struct.key = keyp->serial;
	ad.a.u.key_struct.key_desc = keyp->description;
#endif
	rc = smk_access(tkp, keyp->security, request, &ad);
	rc = smk_bu_note("key access", tkp, keyp->security, request, rc);
	return rc;
}

Project: linux
File: hooks.c

static int selinux_path_notify(const struct path *path, u64 mask,
						unsigned int obj_type)
{
	int ret;
	u32 perm;

	struct common_audit_data ad;

	ad.type = LSM_AUDIT_DATA_PATH;
	ad.u.path = *path;

	/*
	 * Set permission needed based on the type of mark being set.
	 * Performs an additional check for sb watches.
	 */
	switch (obj_type) {
	case FSNOTIFY_OBJ_TYPE_VFSMOUNT:
		perm = FILE__WATCH_MOUNT;
		break;
	case FSNOTIFY_OBJ_TYPE_SB:
		perm = FILE__WATCH_SB;
		ret = superblock_has_perm(current_cred(), path->dentry->d_sb,
						FILESYSTEM__WATCH, &ad);
		if (ret)
			return ret;
		break;
	case FSNOTIFY_OBJ_TYPE_INODE:
		perm = FILE__WATCH;
		break;
	default:
		return -EINVAL;
	}

	/* blocking watches require the file:watch_with_perm permission */
	if (mask & (ALL_FSNOTIFY_PERM_EVENTS))
		perm |= FILE__WATCH_WITH_PERM;

	/* watches on read-like events need the file:watch_reads permission */
	if (mask & (FS_ACCESS | FS_ACCESS_PERM | FS_CLOSE_NOWRITE))
		perm |= FILE__WATCH_READS;

	return path_has_perm(current_cred(), path, perm);
}

Project: linux

static int smack_mmap_file(struct file *file,
			   unsigned long reqprot, unsigned long prot,
			   unsigned long flags)
{
	struct smack_known *skp;
	struct smack_known *mkp;
	struct smack_rule *srp;
	struct task_smack *tsp;
	struct smack_known *okp;
	struct inode_smack *isp;
	struct superblock_smack *sbsp;
	int may;
	int mmay;
	int tmay;
	int rc;

	if (file == NULL)
		return 0;

	if (unlikely(IS_PRIVATE(file_inode(file))))
		return 0;

	isp = smack_inode(file_inode(file));
	if (isp->smk_mmap == NULL)
		return 0;
	sbsp = smack_superblock(file_inode(file)->i_sb);
	if (sbsp->smk_flags & SMK_SB_UNTRUSTED &&
	    isp->smk_mmap != sbsp->smk_root)
		return -EACCES;
	mkp = isp->smk_mmap;

	tsp = smack_cred(current_cred());
	skp = smk_of_current();
	rc = 0;

	rcu_read_lock();
	/*
	 * For each Smack rule associated with the subject
	 * label verify that the SMACK64MMAP also has access
	 * to that rule's object label.
	 */
	list_for_each_entry_rcu(srp, &skp->smk_rules, list) {
		okp = srp->smk_object;
		/*
		 * Matching labels always allows access.
		 */
		if (mkp->smk_known == okp->smk_known)
			continue;
		/*
		 * If there is a matching local rule take
		 * that into account as well.
		 */
		may = smk_access_entry(srp->smk_subject->smk_known,
				       okp->smk_known,
				       &tsp->smk_rules);
		if (may == -ENOENT)
			may = srp->smk_access;
		else
			may &= srp->smk_access;
		/*
		 * If may is zero the SMACK64MMAP subject can't
		 * possibly have less access.
		 */
		if (may == 0)
			continue;

		/*
		 * Fetch the global list entry.
		 * If there isn't one a SMACK64MMAP subject
		 * can't have as much access as current.
		 */
		mmay = smk_access_entry(mkp->smk_known, okp->smk_known,
					&mkp->smk_rules);
		if (mmay == -ENOENT) {
			rc = -EACCES;
			break;
		}
		/*
		 * If there is a local entry it modifies the
		 * potential access, too.
		 */
		tmay = smk_access_entry(mkp->smk_known, okp->smk_known,
					&tsp->smk_rules);
		if (tmay != -ENOENT)
			mmay &= tmay;

		/*
		 * If there is any access available to current that is
		 * not available to a SMACK64MMAP subject
		 * deny access.
		 */
		if ((may | mmay) != mmay) {
			rc = -EACCES;
			break;
		}
	}

	rcu_read_unlock();

	return rc;
}

Project: linux

static int smack_key_alloc(struct key *key, const struct cred *cred,
			   unsigned long flags)
{
	struct smack_known *skp = smk_of_task(smack_cred(cred));

	key->security = skp;
	return 0;
}

Project: linux

static int selinux_sb_alloc_security(struct super_block *sb)
{
	struct superblock_security_struct *sbsec = selinux_superblock(sb);

	mutex_init(&sbsec->lock);
	INIT_LIST_HEAD(&sbsec->isec_head);
	spin_lock_init(&sbsec->isec_lock);
	sbsec->sid = SECINITSID_UNLABELED;
	sbsec->def_sid = SECINITSID_FILE;
	sbsec->mntpoint_sid = SECINITSID_UNLABELED;

	return 0;
}

Project: linux

static int selinux_task_setrlimit(struct task_struct *p, unsigned int resource,
		struct rlimit *new_rlim)
{
	struct rlimit *old_rlim = p->signal->rlim + resource;

	/* Control the ability to change the hard limit (whether
	   lowering or raising it), so that the hard limit can
	   later be used as a safe reset point for the soft limit
	   upon context transitions.  See selinux_bprm_committing_creds. */
	if (old_rlim->rlim_max != new_rlim->rlim_max)
		return avc_has_perm(&selinux_state,
				    current_sid(), task_sid_obj(p),
				    SECCLASS_PROCESS, PROCESS__SETRLIMIT, NULL);

	return 0;
}

Project: linux
File: hooks.c

static int inode_has_perm(const struct cred *cred,
			  struct inode *inode,
			  u32 perms,
			  struct common_audit_data *adp)
{
	struct inode_security_struct *isec;
	u32 sid;

	validate_creds(cred);

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	sid = cred_sid(cred);
	isec = selinux_inode(inode);

	return avc_has_perm(&selinux_state,
			    sid, isec->sid, isec->sclass, perms, adp);
}

Project: linux

static int smack_file_open(struct file *file)
{
	struct task_smack *tsp = smack_cred(file->f_cred);
	struct inode *inode = file_inode(file);
	struct smk_audit_info ad;
	int rc;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
	smk_ad_setfield_u_fs_path(&ad, file->f_path);
	rc = smk_tskacc(tsp, smk_of_inode(inode), MAY_READ, &ad);
	rc = smk_bu_credfile(file->f_cred, file, MAY_READ, rc);

	return rc;
}

Project: linux

static int selinux_task_getscheduler(struct task_struct *p)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_obj(p), SECCLASS_PROCESS,
			    PROCESS__GETSCHED, NULL);
}

Project: linux
File: hooks.c

static int selinux_msg_queue_msgsnd(struct kern_ipc_perm *msq, struct msg_msg *msg, int msqflg)
{
	struct ipc_security_struct *isec;
	struct msg_security_struct *msec;
	struct common_audit_data ad;
	u32 sid = current_sid();
	int rc;

	isec = selinux_ipc(msq);
	msec = selinux_msg_msg(msg);

	/*
	 * First time through, need to assign label to the message
	 */
	if (msec->sid == SECINITSID_UNLABELED) {
		/*
		 * Compute new sid based on current process and
		 * message queue this message will be stored in
		 */
		rc = security_transition_sid(&selinux_state, sid, isec->sid,
					     SECCLASS_MSG, NULL, &msec->sid);
		if (rc)
			return rc;
	}

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = msq->key;

	/* Can this process write to the queue? */
	rc = avc_has_perm(&selinux_state,
			  sid, isec->sid, SECCLASS_MSGQ,
			  MSGQ__WRITE, &ad);
	if (!rc)
		/* Can this process send the message */
		rc = avc_has_perm(&selinux_state,
				  sid, msec->sid, SECCLASS_MSG,
				  MSG__SEND, &ad);
	if (!rc)
		/* Can the message be put in the queue? */
		rc = avc_has_perm(&selinux_state,
				  msec->sid, isec->sid, SECCLASS_MSGQ,
				  MSGQ__ENQUEUE, &ad);

	return rc;
}

Project: linux

static int smack_inet_conn_request(const struct sock *sk, struct sk_buff *skb,
				   struct request_sock *req)
{
	u16 family = sk->sk_family;
	struct smack_known *skp;
	struct socket_smack *ssp = sk->sk_security;
	struct sockaddr_in addr;
	struct iphdr *hdr;
	struct smack_known *hskp;
	int rc;
	struct smk_audit_info ad;
#ifdef CONFIG_AUDIT
	struct lsm_network_audit net;
#endif

#if IS_ENABLED(CONFIG_IPV6)
	if (family == PF_INET6) {
		/*
		 * Handle mapped IPv4 packets arriving
		 * via IPv6 sockets. Don't set up netlabel
		 * processing on IPv6.
		 */
		if (skb->protocol == htons(ETH_P_IP))
			family = PF_INET;
		else
			return 0;
	}
#endif /* CONFIG_IPV6 */

	/*
	 * If there is a secmark use it rather than the CIPSO label.
	 * If there is no secmark fall back to CIPSO.
	 * The secmark is assumed to reflect policy better.
	 */
	skp = smack_from_skb(skb);
	if (skp == NULL) {
		skp = smack_from_netlbl(sk, family, skb);
		if (skp == NULL)
			skp = &smack_known_huh;
	}

#ifdef CONFIG_AUDIT
	smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
	ad.a.u.net->family = family;
	ad.a.u.net->netif = skb->skb_iif;
	ipv4_skb_to_auditdata(skb, &ad.a, NULL);
#endif
	/*
	 * Receiving a packet requires that the other end be able to write
	 * here. Read access is not required.
	 */
	rc = smk_access(skp, ssp->smk_in, MAY_WRITE, &ad);
	rc = smk_bu_note("IPv4 connect", skp, ssp->smk_in, MAY_WRITE, rc);
	if (rc != 0)
		return rc;

	/*
	 * Save the peer's label in the request_sock so we can later setup
	 * smk_packet in the child socket so that SO_PEERCRED can report it.
	 */
	req->peer_secid = skp->smk_secid;

	/*
	 * We need to decide if we want to label the incoming connection here
	 * if we do we only need to label the request_sock and the stack will
	 * propagate the wire-label to the sock when it is created.
	 */
	hdr = ip_hdr(skb);
	addr.sin_addr.s_addr = hdr->saddr;
	rcu_read_lock();
	hskp = smack_ipv4host_label(&addr);
	rcu_read_unlock();

	if (hskp == NULL)
		rc = netlbl_req_setattr(req, &skp->smk_netlabel);
	else
		netlbl_req_delattr(req);

	return rc;
}

Project: linux
File: hooks.c

static int ipc_has_perm(struct kern_ipc_perm *ipc_perms,
			u32 perms)
{
	struct ipc_security_struct *isec;
	struct common_audit_data ad;
	u32 sid = current_sid();

	isec = selinux_ipc(ipc_perms);

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = ipc_perms->key;

	return avc_has_perm(&selinux_state,
			    sid, isec->sid, isec->sclass, perms, &ad);
}

Project: linux

static int smack_file_lock(struct file *file, unsigned int cmd)
{
	struct smk_audit_info ad;
	int rc;
	struct inode *inode = file_inode(file);

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_PATH);
	smk_ad_setfield_u_fs_path(&ad, file->f_path);
	rc = smk_curacc(smk_of_inode(inode), MAY_LOCK, &ad);
	rc = smk_bu_file(file, MAY_LOCK, rc);
	return rc;
}

Project: linux

static int smack_inode_notifysecctx(struct inode *inode, void *ctx, u32 ctxlen)
{
	return smack_inode_setsecurity(inode, XATTR_SMACK_SUFFIX, ctx,
				       ctxlen, 0);
}

Project: linux

static void smack_d_instantiate(struct dentry *opt_dentry, struct inode *inode)
{
	struct super_block *sbp;
	struct superblock_smack *sbsp;
	struct inode_smack *isp;
	struct smack_known *skp;
	struct smack_known *ckp = smk_of_current();
	struct smack_known *final;
	char trattr[TRANS_TRUE_SIZE];
	int transflag = 0;
	int rc;
	struct dentry *dp;

	if (inode == NULL)
		return;

	isp = smack_inode(inode);

	/*
	 * If the inode is already instantiated
	 * take the quick way out
	 */
	if (isp->smk_flags & SMK_INODE_INSTANT)
		return;

	sbp = inode->i_sb;
	sbsp = smack_superblock(sbp);
	/*
	 * We're going to use the superblock default label
	 * if there's no label on the file.
	 */
	final = sbsp->smk_default;

	/*
	 * If this is the root inode the superblock
	 * may be in the process of initialization.
	 * If that is the case use the root value out
	 * of the superblock.
	 */
	if (opt_dentry->d_parent == opt_dentry) {
		switch (sbp->s_magic) {
		case CGROUP_SUPER_MAGIC:
		case CGROUP2_SUPER_MAGIC:
			/*
			 * The cgroup filesystem is never mounted,
			 * so there's no opportunity to set the mount
			 * options.
			 */
			sbsp->smk_root = &smack_known_star;
			sbsp->smk_default = &smack_known_star;
			isp->smk_inode = sbsp->smk_root;
			break;
		case TMPFS_MAGIC:
			/*
			 * What about shmem/tmpfs anonymous files with dentry
			 * obtained from d_alloc_pseudo()?
			 */
			isp->smk_inode = smk_of_current();
			break;
		case PIPEFS_MAGIC:
			isp->smk_inode = smk_of_current();
			break;
		case SOCKFS_MAGIC:
			/*
			 * Socket access is controlled by the socket
			 * structures associated with the task involved.
			 */
			isp->smk_inode = &smack_known_star;
			break;
		default:
			isp->smk_inode = sbsp->smk_root;
			break;
		}
		isp->smk_flags |= SMK_INODE_INSTANT;
		return;
	}

	/*
	 * This is pretty hackish.
	 * Casey says that we shouldn't have to do
	 * file system specific code, but it does help
	 * with keeping it simple.
	 */
	switch (sbp->s_magic) {
	case SMACK_MAGIC:
	case CGROUP_SUPER_MAGIC:
	case CGROUP2_SUPER_MAGIC:
		/*
		 * Casey says that it's a little embarrassing
		 * that the smack file system doesn't do
		 * extended attributes.
		 *
		 * Cgroupfs is special
		 */
		final = &smack_known_star;
		break;
	case DEVPTS_SUPER_MAGIC:
		/*
		 * devpts seems content with the label of the task.
		 * Programs that change smack have to treat the
		 * pty with respect.
		 */
		final = ckp;
		break;
	case PROC_SUPER_MAGIC:
		/*
		 * Casey says procfs appears not to care.
		 * The superblock default suffices.
		 */
		break;
	case TMPFS_MAGIC:
		/*
		 * Device labels should come from the filesystem,
		 * but watch out, because they're volitile,
		 * getting recreated on every reboot.
		 */
		final = &smack_known_star;
		/*
		 * If a smack value has been set we want to use it,
		 * but since tmpfs isn't giving us the opportunity
		 * to set mount options simulate setting the
		 * superblock default.
		 */
		fallthrough;
	default:
		/*
		 * This isn't an understood special case.
		 * Get the value from the xattr.
		 */

		/*
		 * UNIX domain sockets use lower level socket data.
		 */
		if (S_ISSOCK(inode->i_mode)) {
			final = &smack_known_star;
			break;
		}
		/*
		 * No xattr support means, alas, no SMACK label.
		 * Use the aforeapplied default.
		 * It would be curious if the label of the task
		 * does not match that assigned.
		 */
		if (!(inode->i_opflags & IOP_XATTR))
		        break;
		/*
		 * Get the dentry for xattr.
		 */
		dp = dget(opt_dentry);
		skp = smk_fetch(XATTR_NAME_SMACK, inode, dp);
		if (!IS_ERR_OR_NULL(skp))
			final = skp;

		/*
		 * Transmuting directory
		 */
		if (S_ISDIR(inode->i_mode)) {
			/*
			 * If this is a new directory and the label was
			 * transmuted when the inode was initialized
			 * set the transmute attribute on the directory
			 * and mark the inode.
			 *
			 * If there is a transmute attribute on the
			 * directory mark the inode.
			 */
			if (isp->smk_flags & SMK_INODE_CHANGED) {
				isp->smk_flags &= ~SMK_INODE_CHANGED;
				rc = __vfs_setxattr(&init_user_ns, dp, inode,
					XATTR_NAME_SMACKTRANSMUTE,
					TRANS_TRUE, TRANS_TRUE_SIZE,
					0);
			} else {
				rc = __vfs_getxattr(dp, inode,
					XATTR_NAME_SMACKTRANSMUTE, trattr,
					TRANS_TRUE_SIZE);
				if (rc >= 0 && strncmp(trattr, TRANS_TRUE,
						       TRANS_TRUE_SIZE) != 0)
					rc = -EINVAL;
			}
			if (rc >= 0)
				transflag = SMK_INODE_TRANSMUTE;
		}
		/*
		 * Don't let the exec or mmap label be "*" or "@".
		 */
		skp = smk_fetch(XATTR_NAME_SMACKEXEC, inode, dp);
		if (IS_ERR(skp) || skp == &smack_known_star ||
		    skp == &smack_known_web)
			skp = NULL;
		isp->smk_task = skp;

		skp = smk_fetch(XATTR_NAME_SMACKMMAP, inode, dp);
		if (IS_ERR(skp) || skp == &smack_known_star ||
		    skp == &smack_known_web)
			skp = NULL;
		isp->smk_mmap = skp;

		dput(dp);
		break;
	}

	if (final == NULL)
		isp->smk_inode = ckp;
	else
		isp->smk_inode = final;

	isp->smk_flags |= (SMK_INODE_INSTANT | transflag);

	return;
}

Project: linux
File: hooks.c

static int selinux_conn_sid(u32 sk_sid, u32 skb_sid, u32 *conn_sid)
{
	int err = 0;

	if (skb_sid != SECSID_NULL)
		err = security_sid_mls_copy(&selinux_state, sk_sid, skb_sid,
					    conn_sid);
	else
		*conn_sid = sk_sid;

	return err;
}

Project: linux

static int smk_ipv6_check(struct smack_known *subject,
				struct smack_known *object,
				struct sockaddr_in6 *address, int act)
{
#ifdef CONFIG_AUDIT
	struct lsm_network_audit net;
#endif
	struct smk_audit_info ad;
	int rc;

#ifdef CONFIG_AUDIT
	smk_ad_init_net(&ad, __func__, LSM_AUDIT_DATA_NET, &net);
	ad.a.u.net->family = PF_INET6;
	ad.a.u.net->dport = ntohs(address->sin6_port);
	if (act == SMK_RECEIVING)
		ad.a.u.net->v6info.saddr = address->sin6_addr;
	else
		ad.a.u.net->v6info.daddr = address->sin6_addr;
#endif
	rc = smk_access(subject, object, MAY_WRITE, &ad);
	rc = smk_bu_note("IPv6 check", subject, object, MAY_WRITE, rc);
	return rc;
}

Project: linux

static int smack_socket_connect(struct socket *sock, struct sockaddr *sap,
				int addrlen)
{
	int rc = 0;

	if (sock->sk == NULL)
		return 0;
	if (sock->sk->sk_family != PF_INET &&
	    (!IS_ENABLED(CONFIG_IPV6) || sock->sk->sk_family != PF_INET6))
		return 0;
	if (addrlen < offsetofend(struct sockaddr, sa_family))
		return 0;
	if (IS_ENABLED(CONFIG_IPV6) && sap->sa_family == AF_INET6) {
		struct sockaddr_in6 *sip = (struct sockaddr_in6 *)sap;
		struct smack_known *rsp = NULL;

		if (addrlen < SIN6_LEN_RFC2133)
			return 0;
		if (__is_defined(SMACK_IPV6_SECMARK_LABELING))
			rsp = smack_ipv6host_label(sip);
		if (rsp != NULL) {
			struct socket_smack *ssp = sock->sk->sk_security;

			rc = smk_ipv6_check(ssp->smk_out, rsp, sip,
					    SMK_CONNECTING);
		}
		if (__is_defined(SMACK_IPV6_PORT_LABELING))
			rc = smk_ipv6_port_check(sock->sk, sip, SMK_CONNECTING);

		return rc;
	}
	if (sap->sa_family != AF_INET || addrlen < sizeof(struct sockaddr_in))
		return 0;
	rc = smk_ipv4_check(sock->sk, (struct sockaddr_in *)sap);
	return rc;
}

Project: linux
File: hooks.c

static int selinux_secid_to_secctx(u32 secid, char **secdata, u32 *seclen)
{
	return security_sid_to_context(&selinux_state, secid,
				       secdata, seclen);
}

Project: linux
File: hooks.c

static struct inode_security_struct *inode_security(struct inode *inode)
{
	__inode_security_revalidate(inode, NULL, true);
	return selinux_inode(inode);
}

Project: linux
File: hooks.c

static int selinux_kernel_module_request(char *kmod_name)
{
	struct common_audit_data ad;

	ad.type = LSM_AUDIT_DATA_KMOD;
	ad.u.kmod_name = kmod_name;

	return avc_has_perm(&selinux_state,
			    current_sid(), SECINITSID_KERNEL, SECCLASS_SYSTEM,
			    SYSTEM__MODULE_REQUEST, &ad);
}

Project: linux
File: hooks.c

static int selinux_msg_queue_associate(struct kern_ipc_perm *msq, int msqflg)
{
	struct ipc_security_struct *isec;
	struct common_audit_data ad;
	u32 sid = current_sid();

	isec = selinux_ipc(msq);

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = msq->key;

	return avc_has_perm(&selinux_state,
			    sid, isec->sid, SECCLASS_MSGQ,
			    MSGQ__ASSOCIATE, &ad);
}

Project: linux
File: hooks.c

static void selinux_d_instantiate(struct dentry *dentry, struct inode *inode)
{
	if (inode)
		inode_doinit_with_dentry(inode, dentry);
}

Project: linux

static int selinux_watch_key(struct key *key)
{
	struct key_security_struct *ksec = key->security;
	u32 sid = current_sid();

	return avc_has_perm(&selinux_state,
			    sid, ksec->sid, SECCLASS_KEY, KEY__VIEW, NULL);
}

Project: linux
File: hooks.c

static void selinux_nf_ip_exit(void)
{
	pr_debug("SELinux:  Unregistering netfilter hooks\n");

	unregister_pernet_subsys(&selinux_net_ops);
}

Project: linux

static struct smack_known *smack_of_ipc(struct kern_ipc_perm *isp)
{
	struct smack_known **blob = smack_ipc(isp);

	return *blob;
}

Project: linux
File: hooks.c

static int selinux_socket_getpeername(struct socket *sock)
{
	return sock_has_perm(sock->sk, SOCKET__GETATTR);
}

Project: linux

static int smack_netlbl_add(struct sock *sk)
{
	struct socket_smack *ssp = sk->sk_security;
	struct smack_known *skp = ssp->smk_out;
	int rc;

	local_bh_disable();
	bh_lock_sock_nested(sk);

	rc = netlbl_sock_setattr(sk, sk->sk_family, &skp->smk_netlabel);
	switch (rc) {
	case 0:
		ssp->smk_state = SMK_NETLBL_LABELED;
		break;
	case -EDESTADDRREQ:
		ssp->smk_state = SMK_NETLBL_REQSKB;
		rc = 0;
		break;
	}

	bh_unlock_sock(sk);
	local_bh_enable();

	return rc;
}

Project: linux
File: hooks.c

static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
{
	u16 family = sk->sk_family;
	struct sk_security_struct *sksec = sk->sk_security;

	/* handle mapped IPv4 packets arriving via IPv6 sockets */
	if (family == PF_INET6 && skb->protocol == htons(ETH_P_IP))
		family = PF_INET;

	selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
}

Project: linux

static int selinux_inode_setxattr(struct user_namespace *mnt_userns,
				  struct dentry *dentry, const char *name,
				  const void *value, size_t size, int flags)
{
	struct inode *inode = d_backing_inode(dentry);
	struct inode_security_struct *isec;
	struct superblock_security_struct *sbsec;
	struct common_audit_data ad;
	u32 newsid, sid = current_sid();
	int rc = 0;

	if (strcmp(name, XATTR_NAME_SELINUX)) {
		rc = cap_inode_setxattr(dentry, name, value, size, flags);
		if (rc)
			return rc;

		/* Not an attribute we recognize, so just check the
		   ordinary setattr permission. */
		return dentry_has_perm(current_cred(), dentry, FILE__SETATTR);
	}

	if (!selinux_initialized(&selinux_state))
		return (inode_owner_or_capable(mnt_userns, inode) ? 0 : -EPERM);

	sbsec = selinux_superblock(inode->i_sb);
	if (!(sbsec->flags & SBLABEL_MNT))
		return -EOPNOTSUPP;

	if (!inode_owner_or_capable(mnt_userns, inode))
		return -EPERM;

	ad.type = LSM_AUDIT_DATA_DENTRY;
	ad.u.dentry = dentry;

	isec = backing_inode_security(dentry);
	rc = avc_has_perm(&selinux_state,
			  sid, isec->sid, isec->sclass,
			  FILE__RELABELFROM, &ad);
	if (rc)
		return rc;

	rc = security_context_to_sid(&selinux_state, value, size, &newsid,
				     GFP_KERNEL);
	if (rc == -EINVAL) {
		if (!has_cap_mac_admin(true)) {
			struct audit_buffer *ab;
			size_t audit_size;

			/* We strip a nul only if it is at the end, otherwise the
			 * context contains a nul and we should audit that */
			if (value) {
				const char *str = value;

				if (str[size - 1] == '\0')
					audit_size = size - 1;
				else
					audit_size = size;
			} else {
				audit_size = 0;
			}
			ab = audit_log_start(audit_context(),
					     GFP_ATOMIC, AUDIT_SELINUX_ERR);
			if (!ab)
				return rc;
			audit_log_format(ab, "op=setxattr invalid_context=");
			audit_log_n_untrustedstring(ab, value, audit_size);
			audit_log_end(ab);

			return rc;
		}
		rc = security_context_to_sid_force(&selinux_state, value,
						   size, &newsid);
	}
	if (rc)
		return rc;

	rc = avc_has_perm(&selinux_state,
			  sid, newsid, isec->sclass,
			  FILE__RELABELTO, &ad);
	if (rc)
		return rc;

	rc = security_validate_transition(&selinux_state, isec->sid, newsid,
					  sid, isec->sclass);
	if (rc)
		return rc;

	return avc_has_perm(&selinux_state,
			    newsid,
			    sbsec->sid,
			    SECCLASS_FILESYSTEM,
			    FILESYSTEM__ASSOCIATE,
			    &ad);
}

Project: linux
File: hooks.c

static void selinux_tun_dev_free_security(void *security)
{
	kfree(security);
}

Project: linux
File: hooks.c

static int selinux_socket_socketpair(struct socket *socka,
				     struct socket *sockb)
{
	struct sk_security_struct *sksec_a = socka->sk->sk_security;
	struct sk_security_struct *sksec_b = sockb->sk->sk_security;

	sksec_a->peer_sid = sksec_b->sid;
	sksec_b->peer_sid = sksec_a->sid;

	return 0;
}

Project: linux
File: hooks.c

static int selinux_capable(const struct cred *cred, struct user_namespace *ns,
			   int cap, unsigned int opts)
{
	return cred_has_capability(cred, cap, opts, ns == &init_user_ns);
}

Project: linux

static int selinux_binder_set_context_mgr(struct task_struct *mgr)
{
	return avc_has_perm(&selinux_state,
			    current_sid(), task_sid_binder(mgr), SECCLASS_BINDER,
			    BINDER__SET_CONTEXT_MGR, NULL);
}

Project: linux
File: hooks.c

static inline u32 cred_sid(const struct cred *cred)
{
	const struct task_security_struct *tsec;

	tsec = selinux_cred(cred);
	return tsec->sid;
}

Project: linux
File: hooks.c

static int bpf_fd_pass(struct file *file, u32 sid)
{
	struct bpf_security_struct *bpfsec;
	struct bpf_prog *prog;
	struct bpf_map *map;
	int ret;

	if (file->f_op == &bpf_map_fops) {
		map = file->private_data;
		bpfsec = map->security;
		ret = avc_has_perm(&selinux_state,
				   sid, bpfsec->sid, SECCLASS_BPF,
				   bpf_map_fmode_to_av(file->f_mode), NULL);
		if (ret)
			return ret;
	} else if (file->f_op == &bpf_prog_fops) {
		prog = file->private_data;
		bpfsec = prog->aux->security;
		ret = avc_has_perm(&selinux_state,
				   sid, bpfsec->sid, SECCLASS_BPF,
				   BPF__PROG_RUN, NULL);
		if (ret)
			return ret;
	}
	return 0;
}

Project: linux
File: hooks.c

static int selinux_bpf_map(struct bpf_map *map, fmode_t fmode)
{
	u32 sid = current_sid();
	struct bpf_security_struct *bpfsec;

	bpfsec = map->security;
	return avc_has_perm(&selinux_state,
			    sid, bpfsec->sid, SECCLASS_BPF,
			    bpf_map_fmode_to_av(fmode), NULL);
}

Project: linux

static struct smack_known *smack_from_netlbl(const struct sock *sk, u16 family,
					     struct sk_buff *skb)
{
	struct netlbl_lsm_secattr secattr;
	struct socket_smack *ssp = NULL;
	struct smack_known *skp = NULL;

	netlbl_secattr_init(&secattr);

	if (sk)
		ssp = sk->sk_security;

	if (netlbl_skbuff_getattr(skb, family, &secattr) == 0) {
		skp = smack_from_secattr(&secattr, ssp);
		if (secattr.flags & NETLBL_SECATTR_CACHEABLE)
			netlbl_cache_add(skb, family, &skp->smk_netlabel);
	}

	netlbl_secattr_destroy(&secattr);

	return skp;
}

Project: linux
File: hooks.c

static int selinux_socket_connect(struct socket *sock,
				  struct sockaddr *address, int addrlen)
{
	int err;
	struct sock *sk = sock->sk;

	err = selinux_socket_connect_helper(sock, address, addrlen);
	if (err)
		return err;

	return selinux_netlbl_socket_connect(sk, address);
}

Project: linux
File: hooks.c

static int selinux_add_mnt_opt(const char *option, const char *val, int len,
			       void **mnt_opts)
{
	int token = Opt_error;
	int rc, i;

	for (i = 0; i < ARRAY_SIZE(tokens); i++) {
		if (strcmp(option, tokens[i].name) == 0) {
			token = tokens[i].opt;
			break;
		}
	}

	if (token == Opt_error)
		return -EINVAL;

	if (token != Opt_seclabel) {
		val = kmemdup_nul(val, len, GFP_KERNEL);
		if (!val) {
			rc = -ENOMEM;
			goto free_opt;
		}
	}
	rc = selinux_add_opt(token, val, mnt_opts);
	if (unlikely(rc)) {
		kfree(val);
		goto free_opt;
	}
	return rc;

free_opt:
	if (*mnt_opts) {
		selinux_free_mnt_opts(*mnt_opts);
		*mnt_opts = NULL;
	}
	return rc;
}

Project: linux

static int smack_cred_alloc_blank(struct cred *cred, gfp_t gfp)
{
	init_task_smack(smack_cred(cred), NULL, NULL);
	return 0;
}

Project: linux

static __init void init_smack_known_list(void)
{
	/*
	 * Initialize rule list locks
	 */
	mutex_init(&smack_known_huh.smk_rules_lock);
	mutex_init(&smack_known_hat.smk_rules_lock);
	mutex_init(&smack_known_floor.smk_rules_lock);
	mutex_init(&smack_known_star.smk_rules_lock);
	mutex_init(&smack_known_web.smk_rules_lock);
	/*
	 * Initialize rule lists
	 */
	INIT_LIST_HEAD(&smack_known_huh.smk_rules);
	INIT_LIST_HEAD(&smack_known_hat.smk_rules);
	INIT_LIST_HEAD(&smack_known_star.smk_rules);
	INIT_LIST_HEAD(&smack_known_floor.smk_rules);
	INIT_LIST_HEAD(&smack_known_web.smk_rules);
	/*
	 * Create the known labels list
	 */
	smk_insert_entry(&smack_known_huh);
	smk_insert_entry(&smack_known_hat);
	smk_insert_entry(&smack_known_star);
	smk_insert_entry(&smack_known_floor);
	smk_insert_entry(&smack_known_web);
}

Project: linux

static int selinux_file_ioctl(struct file *file, unsigned int cmd,
			      unsigned long arg)
{
	const struct cred *cred = current_cred();
	int error = 0;

	switch (cmd) {
	case FIONREAD:
	case FIBMAP:
	case FIGETBSZ:
	case FS_IOC_GETFLAGS:
	case FS_IOC_GETVERSION:
		error = file_has_perm(cred, file, FILE__GETATTR);
		break;

	case FS_IOC_SETFLAGS:
	case FS_IOC_SETVERSION:
		error = file_has_perm(cred, file, FILE__SETATTR);
		break;

	/* sys_ioctl() checks */
	case FIONBIO:
	case FIOASYNC:
		error = file_has_perm(cred, file, 0);
		break;

	case KDSKBENT:
	case KDSKBSENT:
		error = cred_has_capability(cred, CAP_SYS_TTY_CONFIG,
					    CAP_OPT_NONE, true);
		break;

	/* default case assumes that the command will go
	 * to the file's ioctl() function.
	 */
	default:
		error = ioctl_has_perm(cred, file, FILE__IOCTL, (u16) cmd);
	}
	return error;
}

Project: linux
File: hooks.c

static unsigned int selinux_ipv6_postroute(void *priv,
					   struct sk_buff *skb,
					   const struct nf_hook_state *state)
{
	return selinux_ip_postroute(skb, state->out, PF_INET6);
}

Project: linux

static int selinux_inode_removexattr(struct user_namespace *mnt_userns,
				     struct dentry *dentry, const char *name)
{
	if (strcmp(name, XATTR_NAME_SELINUX)) {
		int rc = cap_inode_removexattr(mnt_userns, dentry, name);
		if (rc)
			return rc;

		/* Not an attribute we recognize, so just check the
		   ordinary setattr permission. */
		return dentry_has_perm(current_cred(), dentry, FILE__SETATTR);
	}

	if (!selinux_initialized(&selinux_state))
		return 0;

	/* No one is allowed to remove a SELinux security label.
	   You can change the label, but all data must be labeled. */
	return -EACCES;
}

Project: linux
File: hooks.c

static int selinux_inode_getattr(const struct path *path)
{
	return path_has_perm(current_cred(), path, FILE__GETATTR);
}

Project: linux
File: hooks.c

static int selinux_ib_pkey_access(void *ib_sec, u64 subnet_prefix, u16 pkey_val)
{
	struct common_audit_data ad;
	int err;
	u32 sid = 0;
	struct ib_security_struct *sec = ib_sec;
	struct lsm_ibpkey_audit ibpkey;

	err = sel_ib_pkey_sid(subnet_prefix, pkey_val, &sid);
	if (err)
		return err;

	ad.type = LSM_AUDIT_DATA_IBPKEY;
	ibpkey.subnet_prefix = subnet_prefix;
	ibpkey.pkey = pkey_val;
	ad.u.ibpkey = &ibpkey;
	return avc_has_perm(&selinux_state,
			    sec->sid, sid,
			    SECCLASS_INFINIBAND_PKEY,
			    INFINIBAND_PKEY__ACCESS, &ad);
}

Project: linux

static int smack_socket_getpeersec_stream(struct socket *sock,
					  char __user *optval,
					  int __user *optlen, unsigned len)
{
	struct socket_smack *ssp;
	char *rcp = "";
	int slen = 1;
	int rc = 0;

	ssp = sock->sk->sk_security;
	if (ssp->smk_packet != NULL) {
		rcp = ssp->smk_packet->smk_known;
		slen = strlen(rcp) + 1;
	}

	if (slen > len)
		rc = -ERANGE;
	else if (copy_to_user(optval, rcp, slen) != 0)
		rc = -EFAULT;

	if (put_user(slen, optlen) != 0)
		rc = -EFAULT;

	return rc;
}

Project: linux
File: hooks.c

static unsigned int selinux_ipv4_forward(void *priv,
					 struct sk_buff *skb,
					 const struct nf_hook_state *state)
{
	return selinux_ip_forward(skb, state->in, PF_INET);
}

Project: linux
File: hooks.c

static void selinux_bprm_committed_creds(struct linux_binprm *bprm)
{
	const struct task_security_struct *tsec = selinux_cred(current_cred());
	u32 osid, sid;
	int rc;

	osid = tsec->osid;
	sid = tsec->sid;

	if (sid == osid)
		return;

	/* Check whether the new SID can inherit signal state from the old SID.
	 * If not, clear itimers to avoid subsequent signal generation and
	 * flush and unblock signals.
	 *
	 * This must occur _after_ the task SID has been updated so that any
	 * kill done after the flush will be checked against the new SID.
	 */
	rc = avc_has_perm(&selinux_state,
			  osid, sid, SECCLASS_PROCESS, PROCESS__SIGINH, NULL);
	if (rc) {
		clear_itimer();

		spin_lock_irq(&current->sighand->siglock);
		if (!fatal_signal_pending(current)) {
			flush_sigqueue(&current->pending);
			flush_sigqueue(&current->signal->shared_pending);
			flush_signal_handlers(current, 1);
			sigemptyset(&current->blocked);
			recalc_sigpending();
		}
		spin_unlock_irq(&current->sighand->siglock);
	}

	/* Wake up the parent if it is waiting so that it can recheck
	 * wait permission to the new task SID. */
	read_lock(&tasklist_lock);
	__wake_up_parent(current, current->real_parent);
	read_unlock(&tasklist_lock);
}

Project: linux
File: hooks.c

static int __net_init selinux_nf_register(struct net *net)
{
	return nf_register_net_hooks(net, selinux_nf_ops,
				     ARRAY_SIZE(selinux_nf_ops));
}

Project: linux

static int smack_inode_getsecctx(struct inode *inode, void **ctx, u32 *ctxlen)
{
	struct smack_known *skp = smk_of_inode(inode);

	*ctx = skp->smk_known;
	*ctxlen = strlen(skp->smk_known);
	return 0;
}

Project: linux

static int smack_add_opt(int token, const char *s, void **mnt_opts)
{
	struct smack_mnt_opts *opts = *mnt_opts;

	if (!opts) {
		opts = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);
		if (!opts)
			return -ENOMEM;
		*mnt_opts = opts;
	}
	if (!s)
		return -ENOMEM;

	switch (token) {
	case Opt_fsdefault:
		if (opts->fsdefault)
			goto out_opt_err;
		opts->fsdefault = s;
		break;
	case Opt_fsfloor:
		if (opts->fsfloor)
			goto out_opt_err;
		opts->fsfloor = s;
		break;
	case Opt_fshat:
		if (opts->fshat)
			goto out_opt_err;
		opts->fshat = s;
		break;
	case Opt_fsroot:
		if (opts->fsroot)
			goto out_opt_err;
		opts->fsroot = s;
		break;
	case Opt_fstransmute:
		if (opts->fstransmute)
			goto out_opt_err;
		opts->fstransmute = s;
		break;
	}
	return 0;

out_opt_err:
	pr_warn("Smack: duplicate mount options\n");
	return -EINVAL;
}

Project: linux

static int smack_flags_to_may(int flags)
{
	int may = 0;

	if (flags & S_IRUGO)
		may |= MAY_READ;
	if (flags & S_IWUGO)
		may |= MAY_WRITE;
	if (flags & S_IXUGO)
		may |= MAY_EXEC;

	return may;
}

Project: linux
File: hooks.c

static int selinux_socket_unix_stream_connect(struct sock *sock,
					      struct sock *other,
					      struct sock *newsk)
{
	struct sk_security_struct *sksec_sock = sock->sk_security;
	struct sk_security_struct *sksec_other = other->sk_security;
	struct sk_security_struct *sksec_new = newsk->sk_security;
	struct common_audit_data ad;
	struct lsm_network_audit net = {0,};
	int err;

	ad.type = LSM_AUDIT_DATA_NET;
	ad.u.net = &net;
	ad.u.net->sk = other;

	err = avc_has_perm(&selinux_state,
			   sksec_sock->sid, sksec_other->sid,
			   sksec_other->sclass,
			   UNIX_STREAM_SOCKET__CONNECTTO, &ad);
	if (err)
		return err;

	/* server child socket */
	sksec_new->peer_sid = sksec_sock->sid;
	err = security_sid_mls_copy(&selinux_state, sksec_other->sid,
				    sksec_sock->sid, &sksec_new->sid);
	if (err)
		return err;

	/* connecting socket */
	sksec_sock->peer_sid = sksec_new->sid;

	return 0;
}

Project: linux
File: hooks.c

static int selinux_syslog(int type)
{
	switch (type) {
	case SYSLOG_ACTION_READ_ALL:	/* Read last kernel messages */
	case SYSLOG_ACTION_SIZE_BUFFER:	/* Return size of the log buffer */
		return avc_has_perm(&selinux_state,
				    current_sid(), SECINITSID_KERNEL,
				    SECCLASS_SYSTEM, SYSTEM__SYSLOG_READ, NULL);
	case SYSLOG_ACTION_CONSOLE_OFF:	/* Disable logging to console */
	case SYSLOG_ACTION_CONSOLE_ON:	/* Enable logging to console */
	/* Set level of messages printed to console */
	case SYSLOG_ACTION_CONSOLE_LEVEL:
		return avc_has_perm(&selinux_state,
				    current_sid(), SECINITSID_KERNEL,
				    SECCLASS_SYSTEM, SYSTEM__SYSLOG_CONSOLE,
				    NULL);
	}
	/* All other syslog types */
	return avc_has_perm(&selinux_state,
			    current_sid(), SECINITSID_KERNEL,
			    SECCLASS_SYSTEM, SYSTEM__SYSLOG_MOD, NULL);
}

Project: linux
File: hooks.c

static int selinux_secmark_relabel_packet(u32 sid)
{
	const struct task_security_struct *__tsec;
	u32 tsid;

	__tsec = selinux_cred(current_cred());
	tsid = __tsec->sid;

	return avc_has_perm(&selinux_state,
			    tsid, sid, SECCLASS_PACKET, PACKET__RELABELTO,
			    NULL);
}

Project: linux

static int smack_fs_context_dup(struct fs_context *fc,
				struct fs_context *src_fc)
{
	struct smack_mnt_opts *dst, *src = src_fc->security;

	if (!src)
		return 0;

	fc->security = kzalloc(sizeof(struct smack_mnt_opts), GFP_KERNEL);
	if (!fc->security)
		return -ENOMEM;
	dst = fc->security;

	if (src->fsdefault) {
		dst->fsdefault = kstrdup(src->fsdefault, GFP_KERNEL);
		if (!dst->fsdefault)
			return -ENOMEM;
	}
	if (src->fsfloor) {
		dst->fsfloor = kstrdup(src->fsfloor, GFP_KERNEL);
		if (!dst->fsfloor)
			return -ENOMEM;
	}
	if (src->fshat) {
		dst->fshat = kstrdup(src->fshat, GFP_KERNEL);
		if (!dst->fshat)
			return -ENOMEM;
	}
	if (src->fsroot) {
		dst->fsroot = kstrdup(src->fsroot, GFP_KERNEL);
		if (!dst->fsroot)
			return -ENOMEM;
	}
	if (src->fstransmute) {
		dst->fstransmute = kstrdup(src->fstransmute, GFP_KERNEL);
		if (!dst->fstransmute)
			return -ENOMEM;
	}
	return 0;
}

Project: linux

static int selinux_key_permission(key_ref_t key_ref,
				  const struct cred *cred,
				  enum key_need_perm need_perm)
{
	struct key *key;
	struct key_security_struct *ksec;
	u32 perm, sid;

	switch (need_perm) {
	case KEY_NEED_VIEW:
		perm = KEY__VIEW;
		break;
	case KEY_NEED_READ:
		perm = KEY__READ;
		break;
	case KEY_NEED_WRITE:
		perm = KEY__WRITE;
		break;
	case KEY_NEED_SEARCH:
		perm = KEY__SEARCH;
		break;
	case KEY_NEED_LINK:
		perm = KEY__LINK;
		break;
	case KEY_NEED_SETATTR:
		perm = KEY__SETATTR;
		break;
	case KEY_NEED_UNLINK:
	case KEY_SYSADMIN_OVERRIDE:
	case KEY_AUTHTOKEN_OVERRIDE:
	case KEY_DEFER_PERM_CHECK:
		return 0;
	default:
		WARN_ON(1);
		return -EPERM;

	}

	sid = cred_sid(cred);
	key = key_ref_to_ptr(key_ref);
	ksec = key->security;

	return avc_has_perm(&selinux_state,
			    sid, ksec->sid, SECCLASS_KEY, perm, NULL);
}

Project: linux

static int smack_msg_msg_alloc_security(struct msg_msg *msg)
{
	struct smack_known **blob = smack_msg_msg(msg);

	*blob = smk_of_current();
	return 0;
}

Project: linux

static int smack_task_setioprio(struct task_struct *p, int ioprio)
{
	return smk_curacc_on_task(p, MAY_WRITE, __func__);
}

Project: linux
File: hooks.c

static int selinux_task_prlimit(const struct cred *cred, const struct cred *tcred,
				unsigned int flags)
{
	u32 av = 0;

	if (!flags)
		return 0;
	if (flags & LSM_PRLIMIT_WRITE)
		av |= PROCESS__SETRLIMIT;
	if (flags & LSM_PRLIMIT_READ)
		av |= PROCESS__GETRLIMIT;
	return avc_has_perm(&selinux_state,
			    cred_sid(cred), cred_sid(tcred),
			    SECCLASS_PROCESS, av, NULL);
}

Project: linux

static int smack_inode_link(struct dentry *old_dentry, struct inode *dir,
			    struct dentry *new_dentry)
{
	struct smack_known *isp;
	struct smk_audit_info ad;
	int rc;

	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_DENTRY);
	smk_ad_setfield_u_fs_path_dentry(&ad, old_dentry);

	isp = smk_of_inode(d_backing_inode(old_dentry));
	rc = smk_curacc(isp, MAY_WRITE, &ad);
	rc = smk_bu_inode(d_backing_inode(old_dentry), MAY_WRITE, rc);

	if (rc == 0 && d_is_positive(new_dentry)) {
		isp = smk_of_inode(d_backing_inode(new_dentry));
		smk_ad_setfield_u_fs_path_dentry(&ad, new_dentry);
		rc = smk_curacc(isp, MAY_WRITE, &ad);
		rc = smk_bu_inode(d_backing_inode(new_dentry), MAY_WRITE, rc);
	}

	return rc;
}

Project: linux
File: hooks.c

static void selinux_bpf_prog_free(struct bpf_prog_aux *aux)
{
	struct bpf_security_struct *bpfsec = aux->security;

	aux->security = NULL;
	kfree(bpfsec);
}

Project: linux
File: hooks.c

static int selinux_inode_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
{
	return may_link(dir, old_dentry, MAY_LINK);
}

Project: linux
File: hooks.c

static int selinux_is_genfs_special_handling(struct super_block *sb)
{
	/* Special handling. Genfs but also in-core setxattr handler */
	return	!strcmp(sb->s_type->name, "sysfs") ||
		!strcmp(sb->s_type->name, "pstore") ||
		!strcmp(sb->s_type->name, "debugfs") ||
		!strcmp(sb->s_type->name, "tracefs") ||
		!strcmp(sb->s_type->name, "rootfs") ||
		(selinux_policycap_cgroupseclabel() &&
		 (!strcmp(sb->s_type->name, "cgroup") ||
		  !strcmp(sb->s_type->name, "cgroup2")));
}

Project: linux
File: hooks.c

static int selinux_socket_create(int family, int type,
				 int protocol, int kern)
{
	const struct task_security_struct *tsec = selinux_cred(current_cred());
	u32 newsid;
	u16 secclass;
	int rc;

	if (kern)
		return 0;

	secclass = socket_type_to_security_class(family, type, protocol);
	rc = socket_sockcreate_sid(tsec, secclass, &newsid);
	if (rc)
		return rc;

	return avc_has_perm(&selinux_state,
			    tsec->sid, newsid, secclass, SOCKET__CREATE, NULL);
}

Project: linux

static void smack_ipc_getsecid(struct kern_ipc_perm *ipp, u32 *secid)
{
	struct smack_known **blob = smack_ipc(ipp);
	struct smack_known *iskp = *blob;

	*secid = iskp->smk_secid;
}

Project: linux
File: hooks.c

static unsigned int selinux_ip_output(struct sk_buff *skb,
				      u16 family)
{
	struct sock *sk;
	u32 sid;

	if (!netlbl_enabled())
		return NF_ACCEPT;

	/* we do this in the LOCAL_OUT path and not the POST_ROUTING path
	 * because we want to make sure we apply the necessary labeling
	 * before IPsec is applied so we can leverage AH protection */
	sk = skb->sk;
	if (sk) {
		struct sk_security_struct *sksec;

		if (sk_listener(sk))
			/* if the socket is the listening state then this
			 * packet is a SYN-ACK packet which means it needs to
			 * be labeled based on the connection/request_sock and
			 * not the parent socket.  unfortunately, we can't
			 * lookup the request_sock yet as it isn't queued on
			 * the parent socket until after the SYN-ACK is sent.
			 * the "solution" is to simply pass the packet as-is
			 * as any IP option based labeling should be copied
			 * from the initial connection request (in the IP
			 * layer).  it is far from ideal, but until we get a
			 * security label in the packet itself this is the
			 * best we can do. */
			return NF_ACCEPT;

		/* standard practice, label using the parent socket */
		sksec = sk->sk_security;
		sid = sksec->sid;
	} else
		sid = SECINITSID_KERNEL;
	if (selinux_netlbl_skbuff_setsid(skb, family, sid) != 0)
		return NF_DROP;

	return NF_ACCEPT;
}

Project: linux
File: hooks.c

static int selinux_msg_queue_msgctl(struct kern_ipc_perm *msq, int cmd)
{
	int err;
	int perms;

	switch (cmd) {
	case IPC_INFO:
	case MSG_INFO:
		/* No specific object, just general system-wide information. */
		return avc_has_perm(&selinux_state,
				    current_sid(), SECINITSID_KERNEL,
				    SECCLASS_SYSTEM, SYSTEM__IPC_INFO, NULL);
	case IPC_STAT:
	case MSG_STAT:
	case MSG_STAT_ANY:
		perms = MSGQ__GETATTR | MSGQ__ASSOCIATE;
		break;
	case IPC_SET:
		perms = MSGQ__SETATTR;
		break;
	case IPC_RMID:
		perms = MSGQ__DESTROY;
		break;
	default:
		return 0;
	}

	err = ipc_has_perm(msq, perms);
	return err;
}

Project: linux

static void smack_cred_free(struct cred *cred)
{
	struct task_smack *tsp = smack_cred(cred);
	struct smack_rule *rp;
	struct list_head *l;
	struct list_head *n;

	smk_destroy_label_list(&tsp->smk_relabel);

	list_for_each_safe(l, n, &tsp->smk_rules) {
		rp = list_entry(l, struct smack_rule, list);
		list_del(&rp->list);
		kmem_cache_free(smack_rule_cache, rp);
	}
}

Project: linux

static int smack_shm_associate(struct kern_ipc_perm *isp, int shmflg)
{
	int may;

	may = smack_flags_to_may(shmflg);
	return smk_curacc_shm(isp, may);
}

Project: linux

static int smack_inode_alloc_security(struct inode *inode)
{
	struct smack_known *skp = smk_of_current();

	init_inode_smack(inode, skp);
	return 0;
}

Project: linux
File: hooks.c

static void selinux_inode_invalidate_secctx(struct inode *inode)
{
	struct inode_security_struct *isec = selinux_inode(inode);

	spin_lock(&isec->lock);
	isec->initialized = LABEL_INVALID;
	spin_unlock(&isec->lock);
}

Project: linux

static void smack_inode_post_setxattr(struct dentry *dentry, const char *name,
				      const void *value, size_t size, int flags)
{
	struct smack_known *skp;
	struct inode_smack *isp = smack_inode(d_backing_inode(dentry));

	if (strcmp(name, XATTR_NAME_SMACKTRANSMUTE) == 0) {
		isp->smk_flags |= SMK_INODE_TRANSMUTE;
		return;
	}

	if (strcmp(name, XATTR_NAME_SMACK) == 0) {
		skp = smk_import_entry(value, size);
		if (!IS_ERR(skp))
			isp->smk_inode = skp;
	} else if (strcmp(name, XATTR_NAME_SMACKEXEC) == 0) {
		skp = smk_import_entry(value, size);
		if (!IS_ERR(skp))
			isp->smk_task = skp;
	} else if (strcmp(name, XATTR_NAME_SMACKMMAP) == 0) {
		skp = smk_import_entry(value, size);
		if (!IS_ERR(skp))
			isp->smk_mmap = skp;
	}

	return;
}

Project: linux

static int smack_watch_key(struct key *key)
{
	struct smk_audit_info ad;
	struct smack_known *tkp = smk_of_current();
	int rc;

	if (key == NULL)
		return -EINVAL;
	/*
	 * If the key hasn't been initialized give it access so that
	 * it may do so.
	 */
	if (key->security == NULL)
		return 0;
	/*
	 * This should not occur
	 */
	if (tkp == NULL)
		return -EACCES;

	if (smack_privileged_cred(CAP_MAC_OVERRIDE, current_cred()))
		return 0;

#ifdef CONFIG_AUDIT
	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_KEY);
	ad.a.u.key_struct.key = key->serial;
	ad.a.u.key_struct.key_desc = key->description;
#endif
	rc = smk_access(tkp, key->security, MAY_READ, &ad);
	rc = smk_bu_note("key watch", tkp, key->security, MAY_READ, rc);
	return rc;
}

Project: linux
File: hooks.c

static int selinux_dentry_create_files_as(struct dentry *dentry, int mode,
					  struct qstr *name,
					  const struct cred *old,
					  struct cred *new)
{
	u32 newsid;
	int rc;
	struct task_security_struct *tsec;

	rc = selinux_determine_inode_label(selinux_cred(old),
					   d_inode(dentry->d_parent), name,
					   inode_mode_to_security_class(mode),
					   &newsid);
	if (rc)
		return rc;

	tsec = selinux_cred(new);
	tsec->create_sid = newsid;
	return 0;
}

Project: linux

static int smack_msg_queue_msgrcv(struct kern_ipc_perm *isp, struct msg_msg *msg,
			struct task_struct *target, long type, int mode)
{
	return smk_curacc_msq(isp, MAY_READWRITE);
}

Project: linux
File: hooks.c

static int selinux_mount(const char *dev_name,
			 const struct path *path,
			 const char *type,
			 unsigned long flags,
			 void *data)
{
	const struct cred *cred = current_cred();

	if (flags & MS_REMOUNT)
		return superblock_has_perm(cred, path->dentry->d_sb,
					   FILESYSTEM__REMOUNT, NULL);
	else
		return path_has_perm(cred, path, FILE__MOUNTON);
}

Project: linux

static int smk_curacc_msq(struct kern_ipc_perm *isp, int access)
{
	struct smack_known *msp = smack_of_ipc(isp);
	struct smk_audit_info ad;
	int rc;

#ifdef CONFIG_AUDIT
	smk_ad_init(&ad, __func__, LSM_AUDIT_DATA_IPC);
	ad.a.u.ipc_id = isp->id;
#endif
	rc = smk_curacc(msp, access, &ad);
	rc = smk_bu_current("msq", msp, access, rc);
	return rc;
}

Project: linux

static int smack_fs_context_parse_param(struct fs_context *fc,
					struct fs_parameter *param)
{
	struct fs_parse_result result;
	int opt, rc;

	opt = fs_parse(fc, smack_fs_parameters, param, &result);
	if (opt < 0)
		return opt;

	rc = smack_add_opt(opt, param->string, &fc->security);
	if (!rc)
		param->string = NULL;
	return rc;
}

Project: linux

static int selinux_is_sblabel_mnt(struct super_block *sb)
{
	struct superblock_security_struct *sbsec = selinux_superblock(sb);

	/*
	 * IMPORTANT: Double-check logic in this function when adding a new
	 * SECURITY_FS_USE_* definition!
	 */
	BUILD_BUG_ON(SECURITY_FS_USE_MAX != 7);

	switch (sbsec->behavior) {
	case SECURITY_FS_USE_XATTR:
	case SECURITY_FS_USE_TRANS:
	case SECURITY_FS_USE_TASK:
	case SECURITY_FS_USE_NATIVE:
		return 1;

	case SECURITY_FS_USE_GENFS:
		return selinux_is_genfs_special_handling(sb);

	/* Never allow relabeling on context mounts */
	case SECURITY_FS_USE_MNTPOINT:
	case SECURITY_FS_USE_NONE:
	default:
		return 0;
	}
}

Project: linux

static int smack_audit_rule_known(struct audit_krule *krule)
{
	struct audit_field *f;
	int i;

	for (i = 0; i < krule->field_count; i++) {
		f = &krule->fields[i];

		if (f->type == AUDIT_SUBJ_USER || f->type == AUDIT_OBJ_USER)
			return 1;
	}

	return 0;
}

Project: linux
File: hooks.c

static int __inode_security_revalidate(struct inode *inode,
				       struct dentry *dentry,
				       bool may_sleep)
{
	struct inode_security_struct *isec = selinux_inode(inode);

	might_sleep_if(may_sleep);

	if (selinux_initialized(&selinux_state) &&
	    isec->initialized != LABEL_INITIALIZED) {
		if (!may_sleep)
			return -ECHILD;

		/*
		 * Try reloading the inode security label.  This will fail if
		 * @opt_dentry is NULL and no dentry for this inode can be
		 * found; in that case, continue using the old label.
		 */
		inode_doinit_with_dentry(inode, dentry);
	}
	return 0;
}

Project: linux

static int smk_skb_to_addr_ipv6(struct sk_buff *skb, struct sockaddr_in6 *sip)
{
	u8 nexthdr;
	int offset;
	int proto = -EINVAL;
	struct ipv6hdr _ipv6h;
	struct ipv6hdr *ip6;
	__be16 frag_off;
	struct tcphdr _tcph, *th;
	struct udphdr _udph, *uh;
	struct dccp_hdr _dccph, *dh;

	sip->sin6_port = 0;

	offset = skb_network_offset(skb);
	ip6 = skb_header_pointer(skb, offset, sizeof(_ipv6h), &_ipv6h);
	if (ip6 == NULL)
		return -EINVAL;
	sip->sin6_addr = ip6->saddr;

	nexthdr = ip6->nexthdr;
	offset += sizeof(_ipv6h);
	offset = ipv6_skip_exthdr(skb, offset, &nexthdr, &frag_off);
	if (offset < 0)
		return -EINVAL;

	proto = nexthdr;
	switch (proto) {
	case IPPROTO_TCP:
		th = skb_header_pointer(skb, offset, sizeof(_tcph), &_tcph);
		if (th != NULL)
			sip->sin6_port = th->source;
		break;
	case IPPROTO_UDP:
	case IPPROTO_UDPLITE:
		uh = skb_header_pointer(skb, offset, sizeof(_udph), &_udph);
		if (uh != NULL)
			sip->sin6_port = uh->source;
		break;
	case IPPROTO_DCCP:
		dh = skb_header_pointer(skb, offset, sizeof(_dccph), &_dccph);
		if (dh != NULL)
			sip->sin6_port = dh->dccph_sport;
		break;
	}
	return proto;
}

Project: linux

static void smack_key_free(struct key *key)
{
	key->security = NULL;
}

Project: linux
File: hooks.c

static int selinux_perf_event_open(struct perf_event_attr *attr, int type)
{
	u32 requested, sid = current_sid();

	if (type == PERF_SECURITY_OPEN)
		requested = PERF_EVENT__OPEN;
	else if (type == PERF_SECURITY_CPU)
		requested = PERF_EVENT__CPU;
	else if (type == PERF_SECURITY_KERNEL)
		requested = PERF_EVENT__KERNEL;
	else if (type == PERF_SECURITY_TRACEPOINT)
		requested = PERF_EVENT__TRACEPOINT;
	else
		return -EINVAL;

	return avc_has_perm(&selinux_state, sid, sid, SECCLASS_PERF_EVENT,
			    requested, NULL);
}

Project: linux
File: hooks.c

static int selinux_socket_getsockopt(struct socket *sock, int level,
				     int optname)
{
	return sock_has_perm(sock->sk, SOCKET__GETOPT);
}

Project: linux
File: hooks.c

static int parse_sid(struct super_block *sb, const char *s, u32 *sid)
{
	int rc = security_context_str_to_sid(&selinux_state, s,
					     sid, GFP_KERNEL);
	if (rc)
		pr_warn("SELinux: security_context_str_to_sid"
		       "(%s) failed for (dev %s, type %s) errno=%d\n",
		       s, sb->s_id, sb->s_type->name, rc);
	return rc;
}

Project: linux
File: hooks.c

static int check_nnp_nosuid(const struct linux_binprm *bprm,
			    const struct task_security_struct *old_tsec,
			    const struct task_security_struct *new_tsec)
{
	int nnp = (bprm->unsafe & LSM_UNSAFE_NO_NEW_PRIVS);
	int nosuid = !mnt_may_suid(bprm->file->f_path.mnt);
	int rc;
	u32 av;

	if (!nnp && !nosuid)
		return 0; /* neither NNP nor nosuid */

	if (new_tsec->sid == old_tsec->sid)
		return 0; /* No change in credentials */

	/*
	 * If the policy enables the nnp_nosuid_transition policy capability,
	 * then we permit transitions under NNP or nosuid if the
	 * policy allows the corresponding permission between
	 * the old and new contexts.
	 */
	if (selinux_policycap_nnp_nosuid_transition()) {
		av = 0;
		if (nnp)
			av |= PROCESS2__NNP_TRANSITION;
		if (nosuid)
			av |= PROCESS2__NOSUID_TRANSITION;
		rc = avc_has_perm(&selinux_state,
				  old_tsec->sid, new_tsec->sid,
				  SECCLASS_PROCESS2, av, NULL);
		if (!rc)
			return 0;
	}

	/*
	 * We also permit NNP or nosuid transitions to bounded SIDs,
	 * i.e. SIDs that are guaranteed to only be allowed a subset
	 * of the permissions of the current SID.
	 */
	rc = security_bounded_transition(&selinux_state, old_tsec->sid,
					 new_tsec->sid);
	if (!rc)
		return 0;

	/*
	 * On failure, preserve the errno values for NNP vs nosuid.
	 * NNP:  Operation not permitted for caller.
	 * nosuid:  Permission denied to file.
	 */
	if (nnp)
		return -EPERM;
	return -EACCES;
}

Project: linux

static int smack_sem_semop(struct kern_ipc_perm *isp, struct sembuf *sops,
			   unsigned nsops, int alter)
{
	return smk_curacc_sem(isp, MAY_READWRITE);
}

Project: linux
File: hooks.c

static int ioctl_has_perm(const struct cred *cred, struct file *file,
		u32 requested, u16 cmd)
{
	struct common_audit_data ad;
	struct file_security_struct *fsec = selinux_file(file);
	struct inode *inode = file_inode(file);
	struct inode_security_struct *isec;
	struct lsm_ioctlop_audit ioctl;
	u32 ssid = cred_sid(cred);
	int rc;
	u8 driver = cmd >> 8;
	u8 xperm = cmd & 0xff;

	ad.type = LSM_AUDIT_DATA_IOCTL_OP;
	ad.u.op = &ioctl;
	ad.u.op->cmd = cmd;
	ad.u.op->path = file->f_path;

	if (ssid != fsec->sid) {
		rc = avc_has_perm(&selinux_state,
				  ssid, fsec->sid,
				SECCLASS_FD,
				FD__USE,
				&ad);
		if (rc)
			goto out;
	}

	if (unlikely(IS_PRIVATE(inode)))
		return 0;

	isec = inode_security(inode);
	rc = avc_has_extended_perms(&selinux_state,
				    ssid, isec->sid, isec->sclass,
				    requested, driver, xperm, &ad);
out:
	return rc;
}

Project: linux

static int selinux_ptrace_access_check(struct task_struct *child,
				       unsigned int mode)
{
	u32 sid = current_sid();
	u32 csid = task_sid_obj(child);

	if (mode & PTRACE_MODE_READ)
		return avc_has_perm(&selinux_state,
				    sid, csid, SECCLASS_FILE, FILE__READ, NULL);

	return avc_has_perm(&selinux_state,
			    sid, csid, SECCLASS_PROCESS, PROCESS__PTRACE, NULL);
}

Project: linux
File: hooks.c

static void ipc_init_security(struct ipc_security_struct *isec, u16 sclass)
{
	isec->sclass = sclass;
	isec->sid = current_sid();
}

Project: linux
File: hooks.c

static int selinux_inode_listxattr(struct dentry *dentry)
{
	const struct cred *cred = current_cred();

	return dentry_has_perm(cred, dentry, FILE__GETATTR);
}

Project: linux

static int selinux_inode_init_security_anon(struct inode *inode,
					    const struct qstr *name,
					    const struct inode *context_inode)
{
	const struct task_security_struct *tsec = selinux_cred(current_cred());
	struct common_audit_data ad;
	struct inode_security_struct *isec;
	int rc;

	if (unlikely(!selinux_initialized(&selinux_state)))
		return 0;

	isec = selinux_inode(inode);

	/*
	 * We only get here once per ephemeral inode.  The inode has
	 * been initialized via inode_alloc_security but is otherwise
	 * untouched.
	 */

	if (context_inode) {
		struct inode_security_struct *context_isec =
			selinux_inode(context_inode);
		if (context_isec->initialized != LABEL_INITIALIZED) {
			pr_err("SELinux:  context_inode is not initialized");
			return -EACCES;
		}

		isec->sclass = context_isec->sclass;
		isec->sid = context_isec->sid;
	} else {
		isec->sclass = SECCLASS_ANON_INODE;
		rc = security_transition_sid(
			&selinux_state, tsec->sid, tsec->sid,
			isec->sclass, name, &isec->sid);
		if (rc)
			return rc;
	}

	isec->initialized = LABEL_INITIALIZED;
	/*
	 * Now that we've initialized security, check whether we're
	 * allowed to actually create this type of anonymous inode.
	 */

	ad.type = LSM_AUDIT_DATA_INODE;
	ad.u.inode = inode;

	return avc_has_perm(&selinux_state,
			    tsec->sid,
			    isec->sid,
			    isec->sclass,
			    FILE__CREATE,
			    &ad);
}

Project: linux

static int selinux_ib_endport_manage_subnet(void *ib_sec, const char *dev_name,
					    u8 port_num)
{
	struct common_audit_data ad;
	int err;
	u32 sid = 0;
	struct ib_security_struct *sec = ib_sec;
	struct lsm_ibendport_audit ibendport;

	err = security_ib_endport_sid(&selinux_state, dev_name, port_num,
				      &sid);

	if (err)
		return err;

	ad.type = LSM_AUDIT_DATA_IBENDPORT;
	ibendport.dev_name = dev_name;
	ibendport.port = port_num;
	ad.u.ibendport = &ibendport;
	return avc_has_perm(&selinux_state,
			    sec->sid, sid,
			    SECCLASS_INFINIBAND_ENDPORT,
			    INFINIBAND_ENDPORT__MANAGE_SUBNET, &ad);
}

Project: linux
File: hooks.c

static void selinux_cred_transfer(struct cred *new, const struct cred *old)
{
	const struct task_security_struct *old_tsec = selinux_cred(old);
	struct task_security_struct *tsec = selinux_cred(new);

	*tsec = *old_tsec;
}

Project: linux

static void smk_bu_mode(int mode, char *s)
{
	int i = 0;

	if (mode & MAY_READ)
		s[i++] = 'r';
	if (mode & MAY_WRITE)
		s[i++] = 'w';
	if (mode & MAY_EXEC)
		s[i++] = 'x';
	if (mode & MAY_APPEND)
		s[i++] = 'a';
	if (mode & MAY_TRANSMUTE)
		s[i++] = 't';
	if (mode & MAY_LOCK)
		s[i++] = 'l';
	if (i == 0)
		s[i++] = '-';
	s[i] = '\0';
}

Project: linux
File: hooks.c

static int selinux_inet_sys_rcv_skb(struct net *ns, int ifindex,
				    char *addrp, u16 family, u32 peer_sid,
				    struct common_audit_data *ad)
{
	int err;
	u32 if_sid;
	u32 node_sid;

	err = sel_netif_sid(ns, ifindex, &if_sid);
	if (err)
		return err;
	err = avc_has_perm(&selinux_state,
			   peer_sid, if_sid,
			   SECCLASS_NETIF, NETIF__INGRESS, ad);
	if (err)
		return err;

	err = sel_netnode_sid(addrp, family, &node_sid);
	if (err)
		return err;
	return avc_has_perm(&selinux_state,
			    peer_sid, node_sid,
			    SECCLASS_NODE, NODE__RECVFROM, ad);
}

Project: linux
File: hooks.c

static int selinux_sctp_assoc_request(struct sctp_endpoint *ep,
				      struct sk_buff *skb)
{
	struct sk_security_struct *sksec = ep->base.sk->sk_security;
	struct common_audit_data ad;
	struct lsm_network_audit net = {0,};
	u8 peerlbl_active;
	u32 peer_sid = SECINITSID_UNLABELED;
	u32 conn_sid;
	int err = 0;

	if (!selinux_policycap_extsockclass())
		return 0;

	peerlbl_active = selinux_peerlbl_enabled();

	if (peerlbl_active) {
		/* This will return peer_sid = SECSID_NULL if there are
		 * no peer labels, see security_net_peersid_resolve().
		 */
		err = selinux_skb_peerlbl_sid(skb, ep->base.sk->sk_family,
					      &peer_sid);
		if (err)
			return err;

		if (peer_sid == SECSID_NULL)
			peer_sid = SECINITSID_UNLABELED;
	}

	if (sksec->sctp_assoc_state == SCTP_ASSOC_UNSET) {
		sksec->sctp_assoc_state = SCTP_ASSOC_SET;

		/* Here as first association on socket. As the peer SID
		 * was allowed by peer recv (and the netif/node checks),
		 * then it is approved by policy and used as the primary
		 * peer SID for getpeercon(3).
		 */
		sksec->peer_sid = peer_sid;
	} else if  (sksec->peer_sid != peer_sid) {
		/* Other association peer SIDs are checked to enforce
		 * consistency among the peer SIDs.
		 */
		ad.type = LSM_AUDIT_DATA_NET;
		ad.u.net = &net;
		ad.u.net->sk = ep->base.sk;
		err = avc_has_perm(&selinux_state,
				   sksec->peer_sid, peer_sid, sksec->sclass,
				   SCTP_SOCKET__ASSOCIATION, &ad);
		if (err)
			return err;
	}

	/* Compute the MLS component for the connection and store
	 * the information in ep. This will be used by SCTP TCP type
	 * sockets and peeled off connections as they cause a new
	 * socket to be generated. selinux_sctp_sk_clone() will then
	 * plug this into the new socket.
	 */
	err = selinux_conn_sid(sksec->sid, peer_sid, &conn_sid);
	if (err)
		return err;

	ep->secid = conn_sid;
	ep->peer_secid = peer_sid;

	/* Set any NetLabel labels including CIPSO/CALIPSO options. */
	return selinux_netlbl_sctp_assoc_request(ep, skb);
}

Project: linux

static int smk_bu_credfile(const struct cred *cred, struct file *file,
				int mode, int rc)
{
	struct task_smack *tsp = smack_cred(cred);
	struct smack_known *sskp = tsp->smk_task;
	struct inode *inode = file_inode(file);
	struct inode_smack *isp = smack_inode(inode);
	char acc[SMK_NUM_ACCESS_TYPE + 1];

	if (isp->smk_flags & SMK_INODE_IMPURE)
		pr_info("Smack Unconfined Corruption: inode=(%s %ld) %s\n",
			inode->i_sb->s_id, inode->i_ino, current->comm);

	if (rc <= 0)
		return rc;
	if (rc > SMACK_UNCONFINED_OBJECT)
		rc = 0;

	smk_bu_mode(mode, acc);
	pr_info("Smack %s: (%s %s %s) file=(%s %ld %pD) %s\n", smk_bu_mess[rc],
		sskp->smk_known, smk_of_inode(inode)->smk_known, acc,
		inode->i_sb->s_id, inode->i_ino, file,
		current->comm);
	return 0;
}

Project: linux
File: hooks.c

static int selinux_mmap_addr(unsigned long addr)
{
	int rc = 0;

	if (addr < CONFIG_LSM_MMAP_MIN_ADDR) {
		u32 sid = current_sid();
		rc = avc_has_perm(&selinux_state,
				  sid, sid, SECCLASS_MEMPROTECT,
				  MEMPROTECT__MMAP_ZERO, NULL);
	}

	return rc;
}

Project: linux

static int selinux_msg_queue_msgrcv(struct kern_ipc_perm *msq, struct msg_msg *msg,
				    struct task_struct *target,
				    long type, int mode)
{
	struct ipc_security_struct *isec;
	struct msg_security_struct *msec;
	struct common_audit_data ad;
	u32 sid = task_sid_obj(target);
	int rc;

	isec = selinux_ipc(msq);
	msec = selinux_msg_msg(msg);

	ad.type = LSM_AUDIT_DATA_IPC;
	ad.u.ipc_id = msq->key;

	rc = avc_has_perm(&selinux_state,
			  sid, isec->sid,
			  SECCLASS_MSGQ, MSGQ__READ, &ad);
	if (!rc)
		rc = avc_has_perm(&selinux_state,
				  sid, msec->sid,
				  SECCLASS_MSG, MSG__RECEIVE, &ad);
	return rc;
}

Project: linux
File: hooks.c

static int selinux_kernfs_init_security(struct kernfs_node *kn_dir,
					struct kernfs_node *kn)
{
	const struct task_security_struct *tsec = selinux_cred(current_cred());
	u32 parent_sid, newsid, clen;
	int rc;
	char *context;

	rc = kernfs_xattr_get(kn_dir, XATTR_NAME_SELINUX, NULL, 0);
	if (rc == -ENODATA)
		return 0;
	else if (rc < 0)
		return rc;

	clen = (u32)rc;
	context = kmalloc(clen, GFP_KERNEL);
	if (!context)
		return -ENOMEM;

	rc = kernfs_xattr_get(kn_dir, XATTR_NAME_SELINUX, context, clen);
	if (rc < 0) {
		kfree(context);
		return rc;
	}

	rc = security_context_to_sid(&selinux_state, context, clen, &parent_sid,
				     GFP_KERNEL);
	kfree(context);
	if (rc)
		return rc;

	if (tsec->create_sid) {
		newsid = tsec->create_sid;
	} else {
		u16 secclass = inode_mode_to_security_class(kn->mode);
		struct qstr q;

		q.name = kn->name;
		q.hash_len = hashlen_string(kn_dir, kn->name);

		rc = security_transition_sid(&selinux_state, tsec->sid,
					     parent_sid, secclass, &q,
					     &newsid);
		if (rc)
			return rc;
	}

	rc = security_sid_to_context_force(&selinux_state, newsid,
					   &context, &clen);
	if (rc)
		return rc;

	rc = kernfs_xattr_set(kn, XATTR_NAME_SELINUX, context, clen,
			      XATTR_CREATE);
	kfree(context);
	return rc;
}

Project: linux
File: hooks.c

static int selinux_sb_eat_lsm_opts(char *options, void **mnt_opts)
{
	char *from = options;
	char *to = options;
	bool first = true;
	int rc;

	while (1) {
		int len = opt_len(from);
		int token;
		char *arg = NULL;

		token = match_opt_prefix(from, len, &arg);

		if (token != Opt_error) {
			char *p, *q;

			/* strip quotes */
			if (arg) {
				for (p = q = arg; p < from + len; p++) {
					char c = *p;
					if (c != '"')
						*q++ = c;
				}
				arg = kmemdup_nul(arg, q - arg, GFP_KERNEL);
				if (!arg) {
					rc = -ENOMEM;
					goto free_opt;
				}
			}
			rc = selinux_add_opt(token, arg, mnt_opts);
			if (unlikely(rc)) {
				kfree(arg);
				goto free_opt;
			}
		} else {
			if (!first) {	// copy with preceding comma
				from--;
				len++;
			}
			if (to != from)
				memmove(to, from, len);
			to += len;
			first = false;
		}
		if (!from[len])
			break;
		from += len + 1;
	}
	*to = '\0';
	return 0;

free_opt:
	if (*mnt_opts) {
		selinux_free_mnt_opts(*mnt_opts);
		*mnt_opts = NULL;
	}
	return rc;
}

Project: linux

static int selinux_inode_setsecurity(struct inode *inode, const char *name,
				     const void *value, size_t size, int flags)
{
	struct inode_security_struct *isec = inode_security_novalidate(inode);
	struct superblock_security_struct *sbsec;
	u32 newsid;
	int rc;

	if (strcmp(name, XATTR_SELINUX_SUFFIX))
		return -EOPNOTSUPP;

	sbsec = selinux_superblock(inode->i_sb);
	if (!(sbsec->flags & SBLABEL_MNT))
		return -EOPNOTSUPP;

	if (!value || !size)
		return -EACCES;

	rc = security_context_to_sid(&selinux_state, value, size, &newsid,
				     GFP_KERNEL);
	if (rc)
		return rc;

	spin_lock(&isec->lock);
	isec->sclass = inode_mode_to_security_class(inode->i_mode);
	isec->sid = newsid;
	isec->initialized = LABEL_INITIALIZED;
	spin_unlock(&isec->lock);
	return 0;
}

Project: linux

static int smack_task_movememory(struct task_struct *p)
{
	return smk_curacc_on_task(p, MAY_WRITE, __func__);
}

Project: linux

static int smack_inode_setsecctx(struct dentry *dentry, void *ctx, u32 ctxlen)
{
	return __vfs_setxattr_noperm(&init_user_ns, dentry, XATTR_NAME_SMACK,
				     ctx, ctxlen, 0);
}

Project: linux

static int smack_socket_sendmsg(struct socket *sock, struct msghdr *msg,
				int size)
{
	struct sockaddr_in *sip = (struct sockaddr_in *) msg->msg_name;
#if IS_ENABLED(CONFIG_IPV6)
	struct sockaddr_in6 *sap = (struct sockaddr_in6 *) msg->msg_name;
#endif
#ifdef SMACK_IPV6_SECMARK_LABELING
	struct socket_smack *ssp = sock->sk->sk_security;
	struct smack_known *rsp;
#endif
	int rc = 0;

	/*
	 * Perfectly reasonable for this to be NULL
	 */
	if (sip == NULL)
		return 0;

	switch (sock->sk->sk_family) {
	case AF_INET:
		if (msg->msg_namelen < sizeof(struct sockaddr_in) ||
		    sip->sin_family != AF_INET)
			return -EINVAL;
		rc = smk_ipv4_check(sock->sk, sip);
		break;
#if IS_ENABLED(CONFIG_IPV6)
	case AF_INET6:
		if (msg->msg_namelen < SIN6_LEN_RFC2133 ||
		    sap->sin6_family != AF_INET6)
			return -EINVAL;
#ifdef SMACK_IPV6_SECMARK_LABELING
		rsp = smack_ipv6host_label(sap);
		if (rsp != NULL)
			rc = smk_ipv6_check(ssp->smk_out, rsp, sap,
						SMK_CONNECTING);
#endif
#ifdef SMACK_IPV6_PORT_LABELING
		rc = smk_ipv6_port_check(sock->sk, sap, SMK_SENDING);
#endif
#endif /* IS_ENABLED(CONFIG_IPV6) */
		break;
	}
	return rc;
}

Project: linux

static void smack_task_getsecid_obj(struct task_struct *p, u32 *secid)
{
	struct smack_known *skp = smk_of_task_struct_obj(p);

	*secid = skp->smk_secid;
}

Project: linux

static struct smack_known *smack_ipv6host_label(struct sockaddr_in6 *sip)
{
	struct smk_net6addr *snp;
	struct in6_addr *sap = &sip->sin6_addr;
	int i;
	int found = 0;

	/*
	 * It's local. Don't look for a host label.
	 */
	if (smk_ipv6_localhost(sip))
		return NULL;

	list_for_each_entry_rcu(snp, &smk_net6addr_list, list) {
		/*
		 * If the label is NULL the entry has
		 * been renounced. Ignore it.
		 */
		if (snp->smk_label == NULL)
			continue;
		/*
		* we break after finding the first match because
		* the list is sorted from longest to shortest mask
		* so we have found the most specific match
		*/
		for (found = 1, i = 0; i < 8; i++) {
			if ((sap->s6_addr16[i] & snp->smk_mask.s6_addr16[i]) !=
			    snp->smk_host.s6_addr16[i]) {
				found = 0;
				break;
			}
		}
		if (found)
			return snp->smk_label;
	}

	return NULL;
}